function login()
{  alert("demo");
var formobj=document.frmLogin;
if(formobj.username.value==""){
		alert(" Please enter your user name.");
		formobj.username.focus();
		return false;
	}
	else
	{
		var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
		checkOK += "_";
		checkOK += "-";
		var checkStr = formobj.username.value;
		var allValid = true;
			for (i = 0;  i < checkStr.length;  i++)
			{
			ch = checkStr.charAt(i);
			for (j = 0;  j < checkOK.length;  j++)
			if (ch == checkOK.charAt(j))
			break;
				if (j == checkOK.length)
				{
				allValid = false;
				break;
				}
			}
		if (!allValid)
		{
		alert("Please enter only letter and numeric characters in the \"first name\" field.");
		formobj.username.focus();
		return (false);
		}
	}
	
	if(formobj.pwd.value==""){
		alert(" Please enter your Password.");
		formobj.pwd.focus();
		return false;
	}
return true;
}