function check_verifycode(obj,targetdiv){
	if (window.XMLHttpRequest){
	req = new XMLHttpRequest();
	} 
	else if (window.ActiveXObject){
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	req.onreadystatechange = function(){processcheck(targetdiv,"")};
	req.open( "get", encodeURI("ajax_verifycode.asp?action=check_verifycode&verifycode="+MM_findObj(obj).value+"&timer="+Math.random()), false );
	req.send();
	if (MM_findObj(targetdiv).innerHTML.indexOf("tip-error.gif")>0){return false;}else{return true;}
}