var xmlobj; //??XMLHttpRequest?? 

function CreateXMLHttpRequest() 
{ 
if(window.ActiveXObject) //?????????ActiveXObject???ActiveXObject?? 
{ 
xmlobj = new ActiveXObject("Microsoft.XMLHTTP"); 
} 
else if(window.XMLHttpRequest) //?????????XMLHttpRequest???XMLHttpRequest?? 
{ 
xmlobj = new XMLHttpRequest(); 
} 
} 

function Validate(id) //????? 
{ 


CreateXMLHttpRequest(); //???? 

var showurl = "add_cart.php?cart_id=" +id; //??URL 

xmlobj.open("GET", showurl, true);//??validate.php 
xmlobj.onreadystatechange = StatHandler; //??URL????????? 
xmlobj.send(null); //????????????? 
return false;
} 

function StatHandler() //????????? 
{ 
if(xmlobj.readyState == 4 && xmlobj.status == 200) //??URL????????? 
{ 
if(xmlobj.responseText==1){alert('1!');return false;}
else{alert(xmlobj.responseText);} 


} 
}