function is_email(obj)
{   



	if (!(document.getElementById(obj.id+"_alert_hidden")==null))
	{
		if (!(obj.value.length>0))
		{
			return true
		}
	}

	if(isEmpty(obj)) 
	{
		return false;
	}

    var i = 1;
    var sLength = obj.value.length;
    while ((i < sLength) && (obj.value.charAt(i) != "@"))
    { i++
    }
    if ((i >= sLength) || (obj.value.charAt(i) != "@")) return false;
    else i += 2;
    while ((i < sLength) && (obj.value.charAt(i) != "."))
    { i++
    }
    if ((i >= sLength - 1) || (obj.value.charAt(i) != ".")) return false;
    else return true;
}

function isEmpty(obj)
{   
	return ((obj.value == null) || (obj.value.length == 0))
}