// JavaScript Document
 function ReadCookie(name)
{
	var mycookie = document.cookie; 
	var start1 = mycookie.indexOf(name + "=");
	if (start1== -1)
		return "";
	else
	{
		start=mycookie.indexOf("=",start1)+1; 
		var end = mycookie.indexOf(";",start);
		if (end==-1)
		{
			end=mycookie.length;
		}
		var value=unescape(mycookie.substring(start,end));
		return value;
	}
}

function Check_login()
{
	var ValidateCode = ReadCookie("WebPlugValidateCode");
	
	if(document.getElementById("txtName") && Trim(document.getElementById("txtName").value) =="")
	{
		alert('用户名不能为空！');
		document.getElementById("txtName").focus();
		return false;
	}
	if(document.getElementById("txtPassword") && Trim(document.getElementById("txtPassword").value) =="")
	{
		alert("密码不能为空!");
		document.getElementById("txtPassword").focus();
		return false;
	}
	if ((document.getElementById("tbValidateCode") && document.getElementById("tbValidateCode").value != ValidateCode) )
	{
		alert("验证码错误，请重新输入！");
		return false;
	}
}