// 验证用户登陆
function CheckLogin() {
       //获取到登陆的名称
        var email = document.getElementById("userlogin").value;
        //获取到登陆的密码
        var Rpass=document.getElementById("passlogin").value;
        if(email==""||email==null)
        {
            alert("Please enter your username！");
            return false;
        }
        else 
        if(Rpass==""||Rpass==null)
        {
             alert("Please enter your password！");
             return false;
        }
        else
        {
            var reg = /^([a-zA-Z0-9]+[_|\_|\.|-]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/;//定义验证邮件的正则表达式
            if(!reg.test(email))
            {
	            alert('User name wrong, please input the correct Email format！');
                document.getElementById("userlogin").value="";
                document.getElementById("userlogin").focus();
                return false;
            }
            else
            {
                return true;
            }
        }
   }