function checkBrowser()
var Sys = {};
var ua = navigator.userAgent.toLowerCase();
var s;
(s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :
(s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :
(s = ua.match(rome\/([\d.]+)/)) ? Sys.chrome = s[1] :
(s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :
(s = ua.match(ersion\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;
if (Sys.ie) stat=0;
if (Sys.firefox) stat=1;
if (Sys.chrome) stat=2;
if (Sys.opera) stat=3;
if (Sys.safari) stat=4;
return stat;
}