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//this code should be run in line at beginning of html page 
//<SCRIPT LANGUAGE = "JavaScript1.2" SRC="checkBrowser.js"> </SCRIPT> 
bName = navigator.appName; //1
bVer = parseInt(navigator.appVersion); //2
errormsg ="This website requires: -- Internet Explorer (version 4 or greater) --or-- Netscape (version 4 or greater)";
//check for JavaScript1.2 compatability = NS4.0+ | IE4.0+
 
if (bName == "Netscape" && bVer < 4) { 
alert(errormsg +"; your version of Netscape is "+bVer);
}else if (bName == "Microsoft Internet Explorer" && bVer < 4) { 
alert(errormsg+"; your version of Internet Explorer (IE) is "+bVer);
}
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