function GetCookie(name)
{
	var CookieString = document.cookie;
	var i = CookieString.indexOf(name+"=")
	if(i >= 0)
	{
		var start = i+name.length + 1;
		var end = CookieString.indexOf(";",start);
		if(end < start)
		{
			end = CookieString.length;
		}
		return unescape(CookieString.substring(start, end));
	}
	return "error";
}
function IsValid(sClientId_UserId,sClientId_Password,sClientId_CheckCode,sCookieName)
{
    var sUserId = document.getElementById(sClientId_UserId).value;
    var sPassword = document.getElementById(sClientId_Password).value;
    if(sUserId == "")
    {
        alert("帐户不能为空！")
        document.getElementById(sClientId_UserId).focus();
        return false;
    }
    else if(sPassword == "")
    {
        alert("密码不能为空！")
        document.getElementById(sClientId_Password).focus();
        return false;
    }
    else
    {
	    var sCookie		= document.cookie;
	    var eCheckCode	= document.getElementById(sClientId_CheckCode);
	    if(sCookie == null)
	    {
		    alert("请支持cookie！");
		    return false;
	    }
	    else if(eCheckCode.value == "")
	    {
		    alert("请输入校验码！");
		    eCheckCode.focus();
		    return false;
	    }
	    else if(GetCookie(sCookieName) != eCheckCode.value)
	    {
		    window.alert("校验码有问题！");
		    eCheckCode.focus();
		    return false;
	    }
	    else
	    {
		    return true;
	    }
    }	    
}
function input_onkeydown(e,sClientId_LoginButton)
{
	if(e.keyCode==13)
	{
		document.getElementById(sClientId_LoginButton).click();
		return false;
	}
}