browserName = navigator.appName; browserVer = parseInt(navigator.appVersion);

if (browserName == "Netscape" && browserVer >= 3) { browserCheck = "ok"; }

else {     

if (browserName == "Microsoft Internet Explorer" && browserVer >= 3) { browserCheck = "ok"; }    

else { browserCheck = "bad"; }

}

if (browserCheck == "ok") { 

b0a = new Image(); b0a.src = "but1.gif";
b0b = new Image(); b0b.src = "but1a.gif";
b1a = new Image(); b1a.src = "but2.gif";
b1b = new Image(); b1b.src = "but2a.gif";
b2a = new Image(); b2a.src = "but3.gif";
b2b = new Image(); b2b.src = "but3a.gif";

}

function imgswap( Iname1, Iname2) { if (browserCheck == "ok") { document [Iname1].src= eval(Iname2 + ".src"); } }