oprp = (navigator.appName = "Opera")? true:false

n4 = false;

if (document.layers) {n4 = true}
ie = (document.all)? true:false;
if (ie) {
	ienaver = navigator.appVersion;
	ienavernum = parseInt(ienaver.charAt(ienaver.indexOf('MSIE')) + 5);
	ie4 = (ienavernum <= 4)? true:false;
	ie5 = (ienavernum > 4)? true:false;

	//ie4 = (ie && navigator.appVersion.indexOf('MSIE 4')>0)? true:false;
	//ie5 = (ie && navigator.appVersion.indexOf('MSIE 5')>0)? true:false;
}