document.getElementById("UserID").focus();
function checkUserIDPassword()
{ 
     var obj = new Array();
     obj.push("UserID");
     obj.push("Password");
     var xmlFields = getXmlFieldsNoPage(obj);
     var result = Login.CheckLogin(xmlFields);
     if(result.value == "false")
     {
        alert("无效的用户名或密码!");
     }
     else
     {
        window.location = "mainframe.aspx?x=" + result.value;
     }
     
}