if( document.images )
{

  but1 = new Image(160,22) ;
  but1.src = "/images/1a.gif";
  but2 = new Image(160,22) ;
  but2.src = "/images/1b.gif";
  
  but3 = new Image(160,22) ;  
  but3.src = "/images/2a.gif";
  but4 = new Image(160,22) ;
  but4.src = "/images/2b.gif";
  
  but5 = new Image(160,22) ;
  but5.src = "/images/3a.gif";
  but6 = new Image(160,22) ;
  but6.src = "/images/3b.gif"; 
  
  but7 = new Image(160,22) ;
  but7.src = "/images/4a.gif";
  but8 = new Image(160,22) ;
  but8.src = "/images/4b.gif";   
  
  but9 = new Image(160,22) ;
  but9.src = "/images/homea.gif";
  but10 = new Image(160,22) ;
  but10.src = "/images/homeb.gif"; 
  
  but20 = new Image(160,22) ;
  but20.src = "/images/online-catalog-on.jpg";
  but21 = new Image(160,22) ;
  but21.src = "/images/online-catalog-off.jpg"; 
  
  
  but22 = new Image(160,22) ;
  but22.src = "/images/button-login-on.jpg";
  but23 = new Image(160,22) ;
  but23.src = "/images/button-login-off.jpg"; 
  }
  
   
function chkVer(imagename,objectsrc)
{
var n=navigator.appName
var v=parseInt(navigator.appVersion)
var browsok=((n=="Netscape")&&(v>=3))
var browsok2=((n=="Microsoft Internet Explorer")&&(v>=4))
if ((browsok)||(browsok2))
document.images[imagename].src=eval(objectsrc+".src")
}