var makesArray = [[6,"BMW"],[7,"Buick"],[8,"Cadillac"],[9,"Chevrolet"],[10,"Chrysler"],[11,"Dodge"],[1,"Ford"],[14,"GMC"],[15,"Honda"],[16,"Hyundai"],[18,"Jeep"],[19,"Kia"],[2,"Lincoln"],[20,"Mazda"],[21,"Nissan"],[23,"Plymouth"],[24,"Pontiac"],[27,"Subaru"],[25,"Suzuki"],[28,"Toyota"]];
var modelsArray = [[610,9,"1500"],[216,10,"300"],[489,28,"4Runner"],[360,20,"626"],[320,16,"Accent"],[382,21,"Altima"],[144,7,"Century"],[342,18,"Cherokee"],[308,15,"Civic"],[631,9,"Cobalt"],[164,8,"De Ville"],[697,8,"DTS"],[248,11,"Durango"],[646,1,"Edge"],[8,1,"Escape"],[12,1,"Expedition"],[14,1,"Explorer Sport Trac"],[16,1,"F150"],[17,1,"F250"],[18,1,"F350"],[21,1,"Focus"],[479,27,"Forester"],[594,1,"Freestyle"],[612,1,"Fusion"],[678,1,"Fusion Hybrid"],[250,11,"Grand Caravan"],[437,24,"Grand Prix"],[190,9,"Impala"],[288,14,"Jimmy"],[347,18,"Liberty"],[193,9,"Malibu"],[690,2,"MKT"],[656,2,"MKX"],[24,1,"Mustang"],[653,9,"OPTRA"],[372,20,"Protege"],[27,1,"Ranger"],[152,7,"Regal"],[353,19,"Rio"],[323,16,"Santa Fe"],[234,10,"Sebring"],[582,14,"Sierra"],[444,24,"Sunfire"],[454,25,"Swift"],[28,1,"Taurus"],[429,23,"Voyager"],[140,6,"X5"],[614,2,"Zephyr"]];

function UpdateModels(makeIdentifier) {

	// Update models when a make is selected by the visitor
	modelObject = document.searchForm.ModelID;
	modelObject.options[0] = new Option();
	modelObject.options[0].value = "";
	modelObject.options[0].text = "Any Model";
	modelObject.selectedIndex = 0;

	var makeObject = document.searchForm.MakeID;
	var makeIdentifier = makeObject.options[makeObject.selectedIndex].value;

	var counter = 1;
	if(makeIdentifier != "") {
		for(var i = 0; i < modelsArray.length; i++) {
			if(modelsArray[i][1] == makeIdentifier) {
				modelObject.options[counter] = new Option();
				modelObject.options[counter].value = modelsArray[i][0];
				modelObject.options[counter].text = modelsArray[i][2];
				counter++;
			}
		}
	}

	modelObject.length = counter;
}

var PrevOnLoadFunction;

function SetupSearchForm() {

	// Call previously installed onload handler
	if(PrevOnLoadFunction) {
		PrevOnLoadFunction();
	}

	// Populate the make select box
	var makeObject = document.searchForm.MakeID;
	makeObject.onchange = UpdateModels;
	makeObject.options[0] = new Option();
	makeObject.options[0].value = "";
	makeObject.options[0].text = "Any Make";
	for(var i = 0; i < makesArray.length; i++) {
		makeObject.options[i+1] = new Option();
		makeObject.options[i+1].value = makesArray[i][0];
		makeObject.options[i+1].text = makesArray[i][1];
	}
	makeObject.length = makesArray.length + 1;
	makeObject.selectedIndex = 0;

	// Populate the model select box
	var modelObject = document.searchForm.ModelID;
	modelObject.options[0] = new Option();
	modelObject.options[0].value = "";
	modelObject.options[0].text = "Any Model";
	modelObject.length = 1;
	modelObject.selectedIndex = 0;
}

PrevOnLoadFunction = window.onload;
window.onload = SetupSearchForm;