function changeModels(categories, models, path){
	if(!path){
		path='';
	}
	var modelsLength=Number(models.length);
	for(var i=(modelsLength-1); i>= 0; i--){
		//models.options[i].selected = false;
		models.options[i] = null;
		//models.options.remove(i);
	}
	models.options[0]=new Option('Загрузка...','');
	models.disabled=true;
	models.options[0].selected = true;

	var req = new Subsys_JsHttpRequest_Js();
	req.onreadystatechange = function(){
		if (req.readyState == 4){
			var res=req.responseJS
			models.options[0] = null;
			models.disabled=false;
			models.options[0]=new Option('любая','');
			for(var i=0; i<res.length;i++){
				models.options[(i+1)]=new Option(res[i].name,res[i].id);
			}
			models.options[0].selected = true;

		}
	}

	req.open('GET', path+'ajax.get_models_list.php?event=getModels&category_id='+categories.value, true);
	req.send({});
}