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 = "but1-0.gif";
b0b = new Image(); b0b.src = "but1-0a.gif";
b1a = new Image(); b1a.src = "but1-1.gif";
b1b = new Image(); b1b.src = "but1-1a.gif";
b2a = new Image(); b2a.src = "but1-2.gif";
b2b = new Image(); b2b.src = "but1-2a.gif";
b3a = new Image(); b3a.src = "but1-3.gif";
b3b = new Image(); b3b.src = "but1-3a.gif";
b4a = new Image(); b4a.src = "but1-4.gif";
b4b = new Image(); b4b.src = "but1-4a.gif";
b5a = new Image(); b5a.src = "but1-5.gif";
b5b = new Image(); b5b.src = "but1-5a.gif";
b6a = new Image(); b6a.src = "but1-6.gif";
b6b = new Image(); b6b.src = "but1-6a.gif";
b7a = new Image(); b7a.src = "but1-7.gif";
b7b = new Image(); b7b.src = "but1-7a.gif";
b8a = new Image(); b8a.src = "but1-8.gif";
b8b = new Image(); b8b.src = "but1-8a.gif";
b9a = new Image(); b9a.src = "but1-9.gif";
b9b = new Image(); b9b.src = "but1-9a.gif";
b10a = new Image(); b10a.src = "but1-10.gif";
b10b = new Image(); b10b.src = "but1-10a.gif";
b11a = new Image(); b11a.src = "but1-11.gif";
b11b = new Image(); b11b.src = "but1-11a.gif";
b12a = new Image(); b12a.src = "but1-12.gif";
b12b = new Image(); b12b.src = "but1-12a.gif";
b13a = new Image(); b13a.src = "but1-13.gif";
b13b = new Image(); b13b.src = "but1-13a.gif";
b14a = new Image(); b14a.src = "but1-14.gif";
b14b = new Image(); b14b.src = "but1-14a.gif";
b15a = new Image(); b15a.src = "but1-15.gif";
b15b = new Image(); b15b.src = "but1-15a.gif";
b16a = new Image(); b16a.src = "but1-16.gif";
b16b = new Image(); b16b.src = "but1-16a.gif";

}

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