var isNav4 = false;
var isIE = false;
var isAdv = false;
var isOpe = false;
if (document.layers) {isNav4 = true}
else if ((document.getElementById)&&(navigator.appName.indexOf("Explorer") < 0)){isAdv = true}
else {isIE = true}
if (navigator.userAgent.indexOf("Opera")!=-1){isOpe = true}