function detectAgent() {

	userAgent = navigator.userAgent.toLowerCase();
	if (navigator.appName == "Netscape" && (parseInt(navigator.appVersion) == 3)) { // NS3
		rightBrowser=false;
	} else 
	if (document.layers) { // NS4
		rightBrowser=false;
	} else
	if (navigator.appName == "Opera" || userAgent.indexOf("opera")>-1 ) { //Opera
		rightBrowser=false;
		
	}
/*	ieWin = (document.all && userAgent.indexOf("mac")<0);
	ieMac = (document.all && !ieWin && !op && userAgent.indexOf("icab")<0);
	w3c = document.documentElement;
	aol = (userAgent.indexOf("aol")>-1);
*/
	
	else rightBrowser=true;	

	return rightBrowser;
}