function submit_djq_number()
{
	delete xmlhttp ;
	var xmlhttp;
	var djq_num=document.getElementById("gift_number").value;
	if(djq_num=="")
	{
		document.getElementById("html_gift_msg").innerHTML="Please enter 代金券 NO.";
		return false;
	}
	if (xmlhttp==null || typeof(xmlhttp)!="object"){
		try{
			xmlhttp= new ActiveXObject('Msxml2.XMLHTTP');
		}catch(e){
			try{
				xmlhttp= new ActiveXObject('Microsoft.XMLHTTP');
			}catch(e){
				try{
					xmlhttp= new XMLHttpRequest();
				}catch(e){}
			}
		}
	}
	xmlhttp.onreadystatechange=function(){
		if (4==xmlhttp.readyState){
			if (200==xmlhttp.status){
				var return_value=xmlhttp.responseText;
				if (return_value != null)
				{
					if(return_value=='err')	
					{
						document.getElementById("html_gift_msg").innerHTML="<strong>The number you put is invalid.</strong>";
						document.getElementById("totalprice").value=document.getElementById("old_totalprice").value;
						document.getElementById("totalprice2").value=document.getElementById("old_totalprice").value;
						document.getElementById("html_totalprice").innerHTML="$" + document.getElementById("old_totalprice").value;
						document.getElementById("djq_number").value="";						
					}
					else if(return_value=='use')
					{
						document.getElementById("html_gift_msg").innerHTML="您输入的代金券号码已被使用.";							
					}
					else 
					{
						totalPrice=parseFloat(document.getElementById("old_totalprice").value)-parseFloat(return_value);
						document.getElementById("totalprice").value=totalPrice;
						document.getElementById("totalprice2").value=totalPrice;
						document.getElementById("html_totalprice").innerHTML="$" + totalPrice;
						document.getElementById("djq_number").value=djq_num;
						document.getElementById("html_gift_msg").innerHTML="此代金券面额 USD" + return_value;
						
					}
				}
				return false;
			}
		delete xmlhttp ; 
		xmlhttp=null;
		CollectGarbage;
		}
	}
	xmlhttp.open("post", "shopping_gift_sub.php", true);
	xmlhttp.setRequestHeader("CONTENT-TYPE","application/x-www-form-urlencoded;text/xml;charset=utf-8");
	xmlhttp.send("ty=djq&id="+djq_num);
	CollectGarbage();
}