var used_models = new Array();
var used_makes = new Array();

used_makes[0]='Acura';
used_models['Acura']='CL,253,Integra,1,Legend,ACC10,MDX,340,NSX,4,RL,5,RSX,367,SLX,254,TL,2,TSX,454,Vigor,ACC09';
used_makes[1]='Aston Martin';
used_models['Aston Martin']='DB5,CDC264,DB7,1142,DB7 Vantage,416,DB9,506,Vanquish,417';
used_makes[2]='Audi';
used_models['Audi']='100,AUC07,200,CDC43,4000,CDC44,5000,CDC45,80,AUC06,90,AUC10,A4,6,A6,7,A8,8,Cabriolet,AUC05,Quattro,AUC09,RS6,452,S4,9,S6,378,S8,342,TT,10,allroad,341';
used_makes[3]='BMW';
used_models['BMW']='318,256,323,17,325,327,328,12,330,312,M3,257,All 3 Series,MGID2,524,CDC23,525,330,528,13,530,329,533,CDC46,535,BMC16,540,16,M5,19,All 5 Series,MGID3,545,467,633,CDC41,635,CDC42,M6,CDC50,All 6 Series,MGID614,645,504,733,CDC47,735,BMC18,740,14,745,387,750,11,760,444,All 7 Series,MGID4,840,BMC02,850,BMC03,All 8 Series,MGID5,L6,CDC48,L7,CDC49,M,18,X3,485,X5,20,Z3,15,Z4,409,Z8,298';
used_makes[4]='Bentley';
used_models['Bentley']='Arnage,420,Azure,419,Brooklands,1146,Continental,418,Continental GT,1228,Turbo R,CDC255';
used_makes[5]='Buick';
used_models['Buick']='Century,21,Electra,CDC51,Estate Wagon,CDC52,Grand National,CDC210,LaCrosse,522,LeSabre,22,Park Avenue,23,Rainier,436,Reatta,CDC53,Regal,24,Rendezvous,360,Riviera,258,Roadmaster,BUC06,Skyhawk,CDC54,Skylark,BUC07,Somerset,CDC55,Terraza,524';
used_makes[6]='Cadillac';
used_models['Cadillac']='Allante,CAC07,Brougham,CAC06,CTS,380,CTS-V,477,Catera,28,Cimarron,CDC56,DeVille,25,Eldorado,26,Escalade,29,Escalade ESV,412,Escalade EXT,371,All Escalades,MGID1030,Fleetwood,CAC03,SRX,459,STS,519,Seville,27,Sixty Special,CAC08,XLR,456';
used_makes[7]='Chevrolet';
used_models['Chevrolet']='Astro,57,Avalanche,CDC236,Aveo,476,Beretta,CHC01,Blazer,46,S10 Blazer,CHS12,All Blazers,MGID9,C1500,259,C2500,50,C3500,51,K1500,CDC211,K1500 Blazer,CHS09,K2500,CDC19,K3500,CDC212,All C/K Series,MGID7,C10,CDC57,C20,CDC58,C30,CDC59,Camaro,36,Caprice,CHC03,Caprice Classic,CDC60,All Caprice Classic,MGID263,Cavalier,37,Celebrity,CDC61,Chevette,CDC62,Citation,CDC63,Cobalt,521,Colorado,458,Corsica,CHC05,Corvette,38,El Camino,CDC64,Equinox,461,Express,58,G10,CDC1,G1500,CDC2,G20,CDC3,G2500,CDC4,G30,CDC5,G3500,CDC6,Impala,44,Lumina,39,Malibu,42,Malibu MAXX,475,Metro,41,Monte Carlo,40,Nova,CDC65,Prizm,43,R10,CDC66,R20,CDC67,R2500,CDC68,R30,CDC69,R3500,CDC70,S10 Pickup,52,SSR,450,Silverado 1500HD,514,Silverado 1500,55,Silverado 2500,56,Silverado 3500,317,All Silverados,MGID524,Spectrum,CDC71,Sprint,CDC72,Suburban,CDC73,New Tahoe,CHS11,Tahoe,48,All Tahoes,MGID8,Tracker,45,Trailblazer,357,Trailblazer EXT,385,All Trailblazers,MGID485,Uplander,525,Venture,59';
used_makes[8]='Chrysler';
used_models['Chrysler']='300,490,300C,491,300M,34,Cirrus,30,Concorde,31,Conquest,CDC74,Crossfire,455,Fifth Avenue,CDC76,Imperial,CRC10,LHS,32,Laser,CDC77,Lebaron,CRC08,Neon,355,New Yorker,CRC05,PT Cruiser,294,PT Cruiser Convertible,505,Pacifica,443,Prowler,356,Sebring,33,Town & Country,35,Grand Voyager,CDC213,Voyager,284,All Voyagers,MGID1031';
used_makes[9]='Daewoo';
used_models['Daewoo']='Lanos,60,Leganza,62,Nubira,61';
used_makes[10]='Daihatsu';
used_models['Daihatsu']='Charade,DHC01,Rocky,DHS01';
used_makes[11]='Dodge';
used_models['Dodge']='600,CDC78,Aries,CDC25,Avenger,63,B150,DOV25,B250,DOV26,B350,DOV27,All B Series,MGID1032,Caravan,73,Grand Caravan,74,All Caravans,MGID526,Charger,558,Colt,DOC02,Conquest,CDC79,D100,CDC80,D150,DOT15,D250,DOT17,D350,DOT19,All D Series,MGID1033,Dakota,69,Daytona,DOC10,Diplomat,CDC81,Durango,68,Dynasty,DOC11,Intrepid,67,Lancer,CDC82,Magnum,492,Mini Ram,CDC83,Monaco,DOC12,Neon,64,Omni,CDC85,Raider,CDC86,Ram 1500,70,Ram 2500,71,Ram 3500,72,Ram 50,DOT14,All Ram Pickups,MGID1034,Ram Van 1500,75,Ram Van 2500,76,Ram Van 3500,77,Ram Wagon 1500,78,Ram Wagon 2500,79,Ram Wagon 3500,80,All Ram Vans,MGID11,Ramcharger,DOS02,Rampage,CDC87,SRT-4,434,Shadow,DOC08,Spirit,DOC09,Sprinter 2500 Chassis,1267,Sprinter 3500 Chassis,1268,Sprinter Van 2500,446,Sprinter Van 3500,447,Sprinter Wagon 2500,448,Stealth,DOC04,Stratus,65,Viper,66';
used_makes[12]='Eagle';
used_models['Eagle']='Medallion,CDC89,Premier,EAC04,Summit,EAC01,Talon,EAC02,Vision,EAC03';
used_makes[13]='Ferrari';
used_models['Ferrari']='348,CDC296,348 SPIDER,CDC297,355 Spyder,CDC253,360,CDC298,360 Modena,283,456,1148,456M,280,550,1153,550 Maranello,CDC254,575M,421,612 Scaglietti,495,Challenge Stradale,494,Daytona,CDC295,Enzo,1310,F355,1149,F550 Maranello,1147';
used_makes[14]='Ford';
used_models['Ford']='Aerostar,FOV15,Aspire,FOC01,Bronco,FOS09,Bronco II,CDC90,Club Wagon,FOV16,Contour,81,Crown Victoria,0,E-150,93,E-250,94,E-350,FOV22,E-450,CDC259,Econoline E150,FOV17,Econoline E250,FOV18,Econoline E350,CDC40,All E Series,MGID527,EXP,CDC92,Escape,299,Escort,82,ZX2,397,All Escorts,MGID528,Excursion,86,Expedition,88,Explorer,87,Explorer Sport,292,Explorer Sport Trac,293,All Explorers,MGID13,F-150,89,F-150 Heritage,466,F-250,90,F-350,91,All F Series,MGID529,Festiva,FOC10,Five Hundred,500,Focus,85,Freestar,469,Freestyle,501,GT,462,LTD,CDC93,Mustang,83,Probe,FOC06,Ranger,92,Taurus,84,Tempo,FOC11,Thunderbird,354,Windstar,96';
used_makes[15]='GMC';
used_models['GMC']='C/K 1500,CDC94,C/K 2500,CDC95,C/K 3500,CDC96,All C/K Series,MGID1035,Caballero,CDC97,Canyon,472,Envoy XUV,465,Envoy,100,Envoy XL,388,All Envoys,MGID242,G1500,CDC9,G2500,CDC10,G3500,CDC11,Jimmy,97,R1500,CDC98,R2500,CDC99,R3500,CDC100,S15,CDC101,Safari,107,Savana,106,Sierra 1500HD,515,Sierra 1500,103,Sierra 2500,104,Sierra 3500,105,All Sierras,MGID530,Sonoma,102,Suburban,CDC240,Yukon XL,CDC238,Yukon,98';
used_makes[16]='Geo';
used_models['Geo']='Metro,GEC01,Prizm,GEC03,Spectrum,CDC104,Storm,GEC04,Tracker,GES02';
used_makes[17]='Honda';
used_models['Honda']='Accord,108,CR-V,113,CRX,CDC214,Civic,109,Element,437,Insight,291,Odyssey,114,Passport,112,Pilot,399,Prelude,110,Ridgeline,552,S2000,111,del Sol,HOC03';
used_makes[18]='Hummer';
used_models['Hummer']='H1,410,Hummer,255,Hummer H1,372,All H1s,MGID1038,H2,398,H2 SUT,511,H2 SUV,510,H3 SUV,544';
used_makes[19]='Hyundai';
used_models['Hyundai']='Accent,115,Elantra,116,Excel,HYC05,Santa Fe,335,Scoupe,HYC06,Sonata,117,Tiburon,118,Tucson,517,XG300,338,XG350,379,All XG Series,MGID16';
used_makes[20]='Infiniti';
used_models['Infiniti']='FX35,442,FX45,431,G20,119,G35,394,G35x,487,I30,120,I35,377,All I Series,MGID17,J30,INC03,M30,INC06,M35,534,M35x,541,M45,411,Q45,121,QX4,122,QX56,480';
used_makes[21]='Isuzu';
used_models['Isuzu']='Ascender,438,Axiom,361,Hombre,124,I-Mark,CDC105,Impulse,ISC06,NPR,CDC260,Oasis,264,Pickup,IST02,Rodeo,123,Amigo,263,Rodeo Sport,332,All Rodeo Sports,MGID18,Stylus,SC07,Trooper,261,Trooper II,CDC106,All Troopers,MGID1036,Vehicross,ISS03';
used_makes[22]='Jaguar';
used_models['Jaguar']='E-Type,CDC215,S-Type,128,X-Type,365,Vanden Plas,CDC216,XJ,400,XJ12,CDC217,XJ6,JAC02,XJ8,127,XJR,125,All XJ Series,MGID533,XJS,JAC03,XK8,126,XKR,129,All XK Series,MGID534';
used_makes[23]='Jeep';
used_models['Jeep']='CJ7,CDC107,Cherokee,131,Comanche,JET01,Grand Cherokee,132,Grand Wagoneer,CDC33,Liberty,362,Scrambler,CDC110,Wagoneer,CDC111,Wrangler,130';
used_makes[24]='Kia';
used_models['Kia']='Amanti,479,Optima,353,Rio,320,Sedona,370,Sorento,413,Spectra5,529,Sephia,133,Spectra,309,All Spectras,MGID535,Sportage,134';
used_makes[25]='Lamborghini';
used_models['Lamborghini']='Diablo,1150,Gallardo,1309,Murcielago,422';
used_makes[26]='Land Rover';
used_models['Land Rover']='Defender,CDC218,Discovery,147,Freelander,381,LR3,518,Range Rover,148,Range Rover Sport,560';
used_makes[27]='Lexus';
used_models['Lexus']='ES250,CDC18,ES300,135,All ES Series,MGID546,ES330,468,GS300,136,GS400,140,GS430,328,All GS Series,MGID19,GX470,430,IS300,311,LS400,137,LS430,339,All LS Series,MGID20,LX450,LES06,LX470,141,All LX Series,MGID21,RX 400h,533,RX300,142,RX330,451,SC300,139,SC400,138,SC430,352,All SC Series,MGID22';
used_makes[28]='Lincoln';
used_models['Lincoln']='Aviator,403,Blackwood,345,Continental,143,LS,145,Mark VII,LIC05,Mark VIII,LIC02,Navigator,146,Town Car,144,Mark LT,538';
used_makes[29]='Lotus';
used_models['Lotus']='Elise,CDC302';
used_makes[30]='MINI';
used_models['MINI']='COOPER S,395,Cooper,390,All Cooper Series,MGID481';
used_makes[31]='Maserati';
used_models['Maserati']='Biturbo,CDC22,Coupe,496,Spyder,426';
used_makes[32]='Mazda';
used_models['Mazda']='323,MAC10,626,152,929,MAC11,B2300,359,B2500,155,B3000,153,B4000,154,Pickup,CDC14,All B Series,MGID23,GLC,CDC112,MAZDASPEED MX-5 Miata,489,MAZDASPEED Protege,405,MPV,156,MX-3,CDC12,MX-5 Miata,149,MX-6,CDC13,Mazda3,481,Mazda6,433,Millenia,150,Navajo,MAS01,Protege,151,Protege5,364,All Proteges,MGID97,RX-7,MAC07,RX-8,441,Tribute,316';
used_makes[33]='Mercedes-Benz';
used_models['Mercedes-Benz']='C220,MBC02,C230,162,C240,336,C280,157,C32 AMG,376,C320,337,C36,MBC04,C43,166,All C-Class,MGID24,C55 AMG,523,CL500,269,CL55 AMG,334,CL600,270,All CL-Class,MGID25,CL65 AMG,532,CLK320,164,CLK430,167,CLK500,406,CLK55 AMG,331,All CLK-Class,MGID26,CLS500,540,CLS55 AMG,545,190D,CDC115,190E,MBC25,260E,CDC118,300CD,CDC119,300D,MBC26,300E,MBC27,300TD,CDC124,300TE,MBC29,400E,MBC33,500E,MBC35,E300,MBC05,E320,158,E420,MBC15,E430,165,E500,404,E55 AMG,168,All E-Class,MGID27,E320 CDI,513,E350,550,G500,382,G55 AMG,440,All G-Class,MGID1037,ML320,170,ML350,439,ML430,171,ML500,375,ML55 AMG,172,All ML-Class,MGID28,300CE,MBC28,300SD,MBC30,300SE,MBC31,300SEL,CDC123,350SD,CDC125,380SE,CDC127,380SEC,CDC221,380SEL,CDC220,400SE,MBC34,400SEL,MBC39,420SEL,CDC36,500SEC,MBC40,500SEL,MBC37,560SEC,CDC28,560SEL,CDC128,600SEC,MBC41,600SEL,MBC38,S320,266,S350,CDC15,S420,267,S430,169,S500,159,S55 AMG,333,S600,268,All S-Class,MGID29,S350,553,S65 AMG,551,300SL,MBC32,380SL,CDC29,450SL,CDC239,450SLC,CDC20,500SL,MBC36,560SL,CDC129,600SL,MBC42,SL320,MBC12,SL500,160,SL55 AMG,402,SL600,161,All SL-Class,MGID30,SL65 AMG,530,SLK230,163,SLK32 AMG,373,SLK320,310,All SLK-Class,MGID31,SLK280,566,SLK350,528,SLK55 AMG,565';
used_makes[34]='Mercury';
used_models['Mercury']='Capri,MEC05,Cougar,173,Grand Marquis,174,Lynx,CDC130,Marauder,396,Mariner,509,Mariner Hybrid,570,Marquis,CDC131,Montego,508,Monterey,470,Mountaineer,177,Mystique,175,Sable,176,Topaz,MEC07,Tracer,271,Villager,178';
used_makes[35]='Mitsubishi';
used_models['Mitsubishi']='3000GT,MIC04,Cordia,CDC132,Diamante,180,Eclipse,179,Eclipse Spyder,273,All Eclipses,MGID436,Endeavor,445,Expo,MIC09,Galant,181,Lancer,369,Lancer Evolution,449,Lancer Sportback,478,Mighty Max,MIT01,Minivan,CDC133,Mirage,182,Montero,183,Montero Sport,184,Outlander,415,Pickup,CDC134,Precis,MIC08,Sigma,CDC135,Spacewagon,CDC219,Starion,CDC136,Tredia,CDC137';
used_makes[36]='Nissan';
used_models['Nissan']='200SX,NIC01,240SX,NIC02,Altima,185,Armada,535,Axxess,CDC138,Frontier,189,Maxima,186,Murano,435,NX,NIC08,Pathfinder,188,Pathfinder Armada,474,Pickup,CDC16,Pulsar,CDC139,Quest,190,Sentra,274,Stanza,NIC07,Titan,460,Xterra,187,280ZX,CDC222,300ZX,NIC03,350Z,389,All Zs,MGID536';
used_makes[37]='Oldsmobile';
used_models['Oldsmobile']='88,OLC05,98,OLC06,Achieva,OLC01,Alero,192,Aurora,275,Bravada,193,Calais,CDC141,Calais Supreme,CDC140,Custom Cruiser,OLC12,Cutlass Calais,CDC142,Cutlass Salon,CDC143,Ciera,OLC03,Cutlass,278,Cutlass Ciera,CDC237,Cutlass Supreme,OLC04,All Cutlass Series,MGID32,Delta 88,CDC144,Firenza,CDC145,Intrigue,191,LSS,277,Omega,CDC146,Regency,OLC10,Silhouette,194,Toronado,OLC13';
used_makes[38]='Plymouth';
used_models['Plymouth']='Acclaim,PLC03,Breeze,195,Caravelle,CDC147,Colt,PLC04,Conquest,CDC148,Gran Fury,CDC149,Horizon,CDC26,Laser,PLC08,Neon,286,Prowler,196,Reliant,CDC150,Sundance,PLC07,Turismo,CDC151,Grand Voyager,CDC27,Voyager,197,All Voyagers,MGID241';
used_makes[39]='Pontiac';
used_models['Pontiac']='1000,CDC152,2000,CDC153,6000,CDC154,Aztek,308,Bonneville,199,Fiero,CDC155,Firebird,200,G6,502,GTO,482,Grand AM,201,Grand Prix,202,Lemans,POC07,Montana,204,Montana SV6,527,Parisienne,CDC156,Phoenix,CDC157,Safari,CDC158,Sunbird,POC08,Sunfire,203,Trans Sport,POV08,Vibe,384';
used_makes[40]='Porsche';
used_models['Porsche']='911,205,924,CDC24,928,PRC04,944,CDC162,968,PRC03,Boxster,206,Carrera GT,486,Cayenne,453';
used_makes[41]='Rolls-Royce';
used_models['Rolls-Royce']='Corniche,428,Park Ward,429,Phantom VI,499,Silver Seraph,427';
used_makes[42]='Saab';
used_models['Saab']='9-2X,512,9-3,218,900,SBC01,All 9-3s,MGID33,9-5,219,9000,SBC02,All 9-5s,MGID34,9-7X,549';
used_makes[43]='Saturn';
used_models['Saturn']='ION,408,L-Series,368,L100,322,L200,323,L300,324,All L Series,MGID507,LS,287,LS1,213,LS2,214,All LS Series,MGID537,LW1,215,LW2,216,LW200,325,LW300,326,All LW Series,MGID538,Relay,531,S-Series,366,SC,SAC09,SC1,209,SC2,210,All SC Series,MGID539,SL,211,SL1,207,SL2,208,All SL Series,MGID540,SW1,279,SW2,212,All SW Series,MGID541,SWP,217,VUE,383';
used_makes[44]='Scion';
used_models['Scion']='tC,516,xA,463,xB,464';
used_makes[45]='Subaru';
used_models['Subaru']='B9 Tribeca,555,Baja,401,Brat,CDC165,DL,CDC166,Forester,223,GL,CDC167,Impreza / Outback Sport,CDC32,Justy,SUC05,Loyale,SUC06,Outback / Legacy,CDC31,STD,CDC168,SVX,SUC03,XT,CDC30';
used_makes[46]='Suzuki';
used_models['Suzuki']='Aerio,391,Aerio SX,392,All Aerios,MGID483,Esteem,224,Forenza,484,Grand Vitara,227,Reno,526,Samurai,SZS02,Sidekick,SZS03,Swift,225,Verona,473,Vitara,226,Vitara V6,471,X-90,SZS04,XL-7,374';
used_makes[47]='Toyota';
used_models['Toyota']='4Runner,234,Avalon,228,Camry,229,Camry Solara,233,Celica,230,Corolla,231,Cressida,TOC08,Echo,232,Highlander,349,Highlander Hybrid,554,Land Cruiser,236,MR2,TOC07,MR2 Spyder,295,Matrix,386,Minivan,CDC170,Paseo,TOC05,Pickup,CDC17,Previa,TOV10,Prius,318,Rav4,235,Rav4 EV,393,Sequoia,344,Sienna,239,Starlet,CDC171,Supra,TOC13,T100,TOT08,Tacoma,237,Tercel,TOC06,Tundra,238';
used_makes[48]='Volkswagen';
used_models['Volkswagen']='Cabrio,246,Cabriolet,VWC01,All Cabrios,MGID36,Corrado,VWC07,EuroVan,252,Fox,VWC06,GTI,251,Golf,247,Jetta,248,New Beetle,250,Passat,249,Phaeton,483,Quantum,CDC172,R32,488,Rabbit,CDC173,Scirocco,CDC174,Touareg,432,Vanagon,CDC175';
used_makes[49]='Volvo';
used_models['Volvo']='240,VOC03,740,VOC04,760,CDC176,780,CDC177,850,VOC01,940,VOC05,960,VOC02,All 9 Series,MGID545,C70,242,Coupe,CDC178,DL,CDC179,GL,CDC180,GLT,CDC181,S40,244,S60,343,S70,241,S80,243,S90,VOC09,V40,245,V50,520,V70,240,V90,VOC08,XC70,414,XC90,407';

function clearListUsed( optionList, titleName ) {
    optionList.length = 0;
    optionList.options[0] = new Option( titleName, '', true, true );
}

function loadModelsAtUsed( index ) {        
    if( index > 0 ) {
        var make = getSelectedMakeUsed();
        var currentModels = used_models[ make ].split( ',' );
        var selectModel = "";
        var selectedModelIndex = 0;
        
        for( var i = 0; i < currentModels.length / 2; i++ ) {            
            if(selectModel == currentModels[ i * 2]){
              selectedModelIndex = i+1;             
            }
            if(currentModels[ i * 2].indexOf("All") != -1){
              if(selectModel == currentModels[ i * 2].substring(4)){
                selectedModelIndex = i+1;
              }
            }
            
            document.forms["yearmakemodel"].used_model.options[ i + 1 ] = 
                new Option( currentModels[ i * 2 ], currentModels[ i * 2 + 1 ], false, false );
        }
       document.forms["yearmakemodel"].used_model.options[selectedModelIndex].selected = true;       
    }
}

function LoadMakesUsed() {         
    var index = 0;
    var selectMake = "";
    var usedMake = document.forms["yearmakemodel"].used_make.selectedIndex;
    var setModel = false;
    var selectedMakeIndex = 0;

    for( var i = 0; i < used_makes.length; i++ ) { 
        if(selectMake == used_makes[ i ])
            selectedMakeIndex = i+1;                   
        document.forms["yearmakemodel"].used_make.options[ ++index ] = new Option( used_makes[ i ], used_makes[ i ], false, false);      
    }
    if (usedMake > 0) {
      selectedMakeIndex = usedMake;
      setModel = true;
    }
    document.forms["yearmakemodel"].used_make.options[ selectedMakeIndex ].selected = true;    
        changeModelUsed(setModel);
}

function changeModelUsed( fromOnLoad ) {    
    if(document.forms["yearmakemodel"].used_model.value=""){
      document.forms["yearmakemodel"].used_model.value=document.forms["yearmakemodel"].model_group_id.value;
    }
    var currModel = document.forms["yearmakemodel"].used_model.selectedIndex;        
    var selectedMake = getSelectedMakeUsed();

    clearListUsed( document.forms["yearmakemodel"].used_model, 'Please Select A Model' );
    loadModelsAtUsed( document.forms["yearmakemodel"].used_make.selectedIndex );       

    if( fromOnLoad ) {
        document.forms["yearmakemodel"].used_model.selectedIndex = currModel;
   }
}

function checkMakeUsed() { 
    return getSelectedMakeUsed() != null;
}

function alertMakeUsed() {
    if( ! checkMakeUsed() ) {
        alert( 'Please select a make first.' );
        return false;
    }
    return true;
}

function checkModelUsed() {
    return getSelectedModelUsed() != null;
}

function checkZipUsed( zipcode ) {
    var result = zipcode.length == 5;
 
    for( var i = 0; i < zipcode.length; i++ ) {
        if( zipcode.substring( i , i + 1 ) < "0" || zipcode.substring( i , i + 1 ) > "9" ) {
            result = false;
            break;
        }
    }
    return result;
}

function getSelectedModelUsed() {
    var result = document.forms["yearmakemodel"].used_model.options[document.forms["yearmakemodel"].used_model.selectedIndex].value;
    return result == "" ? null : result;
}

function getSelectedMakeUsed() {
    var result = document.forms["yearmakemodel"].used_make.options[document.forms["yearmakemodel"].used_make.selectedIndex].value;
    return result == "" ? null : result;
}