function checkBrowser() {

	<!-- hide JavaScript from non-JavaScript browsers
	// This script is a simplified adaptation from the
	// JavaScript Browser Sniffer
	// Eric Krok, Andy King, Michel Plungjan
	// see http://www.webreference.com/ for more information
	
	var agt=navigator.userAgent.toLowerCase();
	var appVer = navigator.appVersion.toLowerCase();
	var is_minor = parseFloat(appVer);
	var is_major = parseInt(is_minor);
	var iePos = appVer.indexOf('msie');
	if (iePos !=-1) {
		is_minor = parseFloat(appVer.substring(iePos+5,appVer.indexOf(';',iePos)))
		is_major = parseInt(is_minor);
	}
	var is_getElementById = (document.getElementById) ? "true" : "false"; 
	var is_getElementsByTagName = (document.getElementsByTagName) ? "true" : "false";
	var is_documentElement = (document.documentElement) ? "true" : "false"; 
	var is_ie = ((iePos!=-1));
	var is_ie3 = (is_ie && (is_major < 4));
	var is_ie4 = (is_ie && is_major == 4);
	var is_ie4up = (is_ie && is_minor >= 4);
	var is_ie5 = (is_ie && is_major == 5);
	var is_ie5up = (is_ie && is_minor >= 5);
	var is_ie5_5 = (is_ie && (agt.indexOf("msie 5.5") !=-1)); 
	var is_ie5_5up =(is_ie && is_minor >= 5.5); 
	var is_ie6 = (is_ie && is_major == 6);
	var is_ie6up = (is_ie && is_minor >= 6);
	// -->

	return is_ie6;
}