function isexist(_obj) {
    var obj = document.getElementById(_obj.name);
    var info = document.getElementById(_obj.name + "info");
    var abc=false;
    var xmlHttp;
    if (obj.value.length > 0) {
        if (window.ActiveXObject) {
            xmlHttp = new ActiveXObject("microsoft.xmlhttp");
        } else {
            if (window.XMLHttpRequest) {
                xmlHttp = new XMLHttpRequest();
            }
        }
        xmlHttp.onreadystatechange =function () {
            if (xmlHttp.readyState == 4) {
                var xml = xmlHttp.responseText;
                var xmlRoot = xml.documentElement;
                if (xmlHttp.status == 200 && xmlHttp.responseText != "") {
                    alert(xmlHttp.readyState);
                    showInfo(info, obj.title + xmlHttp.responseText, "red");
                    return false;
                } else {
                    return true;
                }
            }
        }
        xmlHttp.open("get", "CheckIsExist.action?" + _obj.name + "=" + _obj.value, false);
        xmlHttp.send(null);
        
    }
}