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 = "but0.gif";
b0b = new Image(); b0b.src = "but0a.gif";
b1a = new Image(); b1a.src = "but1.gif";
b1b = new Image(); b1b.src = "but1a.gif";
b2a = new Image(); b2a.src = "but2.gif";
b2b = new Image(); b2b.src = "but2a.gif";
b3a = new Image(); b3a.src = "but3.gif";
b3b = new Image(); b3b.src = "but3a.gif";
b4a = new Image(); b4a.src = "but4.gif";
b4b = new Image(); b4b.src = "but4a.gif";
b5a = new Image(); b5a.src = "but5.gif";
b5b = new Image(); b5b.src = "but5a.gif"; 
b6a = new Image(); b6a.src = "but6.gif";
b6b = new Image(); b6b.src = "but6a.gif";
b7a = new Image(); b7a.src = "but7.gif";
b7b = new Image(); b7b.src = "but7a.gif";
b8a = new Image(); b8a.src = "but8.gif";
b8b = new Image(); b8b.src = "but8a.gif";
b9a = new Image(); b9a.src = "but9.gif";
b9b = new Image(); b9b.src = "but9a.gif";
b10a = new Image(); b10a.src = "but10.gif";
b10b = new Image(); b10b.src = "but10a.gif";
b11a = new Image(); b11a.src = "but11.gif";
b11b = new Image(); b11b.src = "but11a.gif";


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