browsername=navigator.appName;
	if (browsername.indexOf("Netscape")!=-1) {browsername="NS"}
	else {
		if (browsername.indexOf("Microsoft")!=-1) {browsername="MSIE"}
	  	else {browsername="N/A"}
	};
	
	browser="0";
	if (navigator.appVersion.indexOf("2.0")!=-1) {browser="2"};
	if (navigator.appVersion.indexOf("3.0")!=-1) {browser="3"};
	if (navigator.appVersion.indexOf("4.0")!=-1) {browser="4"};
	if (browsername=="MSIE" && browser < 4) //if IE2 or IE3, don't use image switch
		{imswitch = false;} 
	else {imswitch = true;}