function changeModel(el,auction,val){
	var cur=el.options[el.selectedIndex].value;
	var form=el.form;

	var callback=function(r){
		try{
			eval('var DATA='+r.responseText);
		}catch(e){
			return;
		}
		if(!form.model||!DATA)return;
		for (var n=form.model.options.length - 1; n > -1; n--) {
			form.model.options[n]=null;
		}
		if(cur=='')return;
		var models=DATA['models'];
		var i=0;
		form.model.options[i++]=new Option('','',false,''==val?true:false)
		for (var n in models){
			form.model.options[i++]=new Option(models[n],n,false,n==val?true:false)
		}
		if(!val&&form.model.options[0]){
			form.model.options[0].selected=true;
		}
	}
	ajax.sendPOST('/index.php?AJAX=auctions.getModels','json={auction:"'+auction+'",make:"'+cur+'"}',callback);
}