function change_categories(lang, pre){
	if($("#categories").val() !=""){
		$.ajax({
            type: "POST",
            url: "/get_products.php",
            data: 'post_type=get_products&category_id=' + $("#categories").val() + '&lang=' + lang + '&pre=' + pre,
            dataType: "xml",
            success: function(xml)
				{
					var products_list = document.getElementById("products_list");
					if(products_list.options.length > 0)
						clearlistbox(products_list);
					
					var opt = document.createElement("option");
					opt.text = lang == "vn"?"Chọn mẩu":"Select model";
					opt.value = "";
					
					try {
						products_list.add(opt,null); // Standards compliant.
					} catch (e) {
						products_list.add(opt);      // IE only version.
					}
					opt = null;
					
					$(xml).find('Item').each(function(){
						var code = $(this).find('code').text();
						var model = $(this).find('model').text();
						
						var opt = document.createElement("option");
                        opt.text = model;
                        opt.value = code;
                        opt.friendly = "asdsad";
						
                        try {
                            products_list.add(opt,null); // Standards compliant.
                        } catch (e) {
                            products_list.add(opt);      // IE only version.
                        }
                        opt = null;
					});
					$('#products_list').msDropDown();
					if($.browser.msie){
						$('#products_list_msdd').width(186);
						$('#products_list_child').width(186);
					}
					
					//document.getElementById('products_list').refresh(); 
                }
            });
		//$('body select').msDropDown();
		
		//document.getElementById('products_list').refresh(); 
	}else{
		var products_list = document.getElementById("products_list");
		if(products_list.options.length > 0)
			clearlistbox(products_list);
		
		var opt = document.createElement("option");
		opt.text = "";
		opt.value = "";
		
		try {
			products_list.add(opt,null); // Standards compliant.
		} catch (e) {
			products_list.add(opt);      // IE only version.
		}
		opt = null;
		document.getElementById('products_list').refresh();
	}
}

function view_product(lang, pre){
	var pid = $("#products_list").val();
	var cid = $("#categories").val();
	
	if(pid !="" && cid != ""){
		var tmp = pid.split("#");
		pid = tmp[1];
		
		var link = "/" + lang + "/product/" + pid +"/"+ (pre == "1"?"view/":"") + tmp[0] + ".html";
		window.location.href = link;
	}
}

function view_service_center(obj, lang, pre){
	if(!obj)return;
	var province_id = obj.value;
	var province_text = obj.options[obj.selectedIndex].text;
	province_text = province_text.replace(" ", "-");
	province_text = province_text.toLowerCase();
	
	if(province_id !="" && parseInt(province_id) > 0){
		window.location.href="/" + lang + "/services-center/" + province_id + "/" + (pre == "1"?"view/":"") + province_text + ".html";
	}
}

function clearlistbox(selectbox)
{
    var i;
    for(i=selectbox.options.length-1;i>=0;i--)
    {
		selectbox.remove(i);
    }
}