function isExistEmail(value) {
	var xmlhttp = PS.createXMLHttpRequest();
	try {
		if(value=="") {
			return true;
		}else{
			url = "/member/view/checkexistemail.fs?key="
			url += encodeURIComponent(value);
			url+="&d=" + encodeURIComponent(new Date().getTime());
			xmlhttp.open("GET",url,false);
			xmlhttp.send("go");
			var doc = xmlhttp.responseXML;
			var c = doc.getElementsByTagName("c")[0].firstChild.nodeValue;
			if(c=="0") {
				return false;
			}else {
				return true;
			}
		}
	}catch(e) {
	}
}