var IE4 = (document.all && !(document.getElementById)) ? true : false;
var IE5 = ((navigator.appVersion.indexOf("MSIE 5") != -1) || (navigator.appVersion.indexOf("MSIE 6") != -1) || (navigator.appVersion.indexOf("MSIE 7") != -1)  || (navigator.appVersion.indexOf("MSIE 8") != -1)) ? true: false;
var dom = (document.getElementById) ? true : false;
var NS = (navigator.appName.indexOf("Netscape")  != -1) ? true: false;
var NS6 = (NS && dom) ? true: false;
var NN4 = (document.layers) ? true : false;
var DHTML = (IE4 || IE5 || NS6) ? true : false;


if ((navigator.userAgent.indexOf("Opera") != -1) && (navigator.userAgent.indexOf("Opera 7.") == -1)) DHTML = false;
if (navigator.appVersion.indexOf("Mac")  != -1) DHTML = false;