userAgen=(navigator.userAgent);
locMSIE=userAgen.indexOf("MSIE");
locNS=userAgen.indexOf("Netscape");
locOpera=userAgen.indexOf("Opera");
locFirefox=userAgen.indexOf("Firefox");
locMozilla=userAgen.indexOf("Mozilla");
locGecko=userAgen.indexOf("Gecko");

if (locOpera != -1) {
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}
else if(locMSIE != -1 || locFirefox != -1 || locNS != -1 || locMozilla != -1) {
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}