function emailvalidation(entered,alertbox)
{
	with (entered)
	{
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = value;
   if(reg.test(address) == false)
		{
			if (alertbox)
			{
				alert(alertbox);
			}
			return false;
		}
		else {return true;}
	}
}

function emptyvalidation(entered, alertbox)
{
	with (entered)
	{
		while (value.charAt(0) == ' ')
			value = value.substring(1);
		while (value.charAt(value.length - 1) == ' ')
			value = value.substring(0, value.length - 1);
		if (value==null || value=="")
		{
			if (alertbox!="") alert(alertbox);
			return false;
		}
		else return true;
	}
}