var ns6 = document.getElementById && !document.all;
var ie4 = document.all && navigator.userAgent.indexOf("Opera")==-1;

function isEmail(s)
{
	var re =/^[\w-](\.?[\w-])*@([A-Za-z]{2,}|[\w-](\.?[\w-])*\.[A-Za-z]{2,})$/i;
	return re.test(s);
}

function isNotEmpty(s)
{
    if (s=="")
		return false;
	else
		return true;
}

function openImg(urlPrefix, s, t, w, h)
{
	window.open(urlPrefix+"showimage.php?s="+s+"&t="+t+"&w="+w+"&h="+h, "", "width="+w+",height="+h+",status=yes,toolbar=no,menubar=no,location=no,resizable=yes,scrollbars=no");
	return false;
}