if( document.images )
{

  but1 = new Image(160,22) ;
  but1.src = "images/btn1.gif";
  but2 = new Image(160,22) ;
  but2.src = "images/btn1on.gif";
  
  but3 = new Image(160,22) ;  
  but3.src = "images/btn2.gif";
  but4 = new Image(160,22) ;
  but4.src = "images/btn2on.gif";
  
  but5 = new Image(160,22) ;
  but5.src = "images/btn3.gif";
  but6 = new Image(160,22) ;
  but6.src = "images/btn3on.gif"; 
  
  but7 = new Image(160,22) ;
  but7.src = "images/btn4.gif";
  but8 = new Image(160,22) ;
  but8.src = "images/btn4on.gif"; 
  
  but9 = new Image(160,22) ;
  but9.src = "images/btn5.gif";
  but10 = new Image(160,22) ;
  but10.src = "images/btn5on.gif"; 
  
  but11 = new Image(160,22) ;
  but11.src = "images/btn6.gif";
  but12 = new Image(160,22) ;
  but12.src = "images/btn6on.gif"; 
  
  but13 = new Image(160,22) ;
  but13.src = "images/btn7.gif";
  but14 = new Image(160,22) ;
  but14.src = "images/btn7on.gif"; 
  
  but15 = new Image(160,22) ;
  but15.src = "images/btn8.gif";
  but16 = new Image(160,22) ;
  but16.src = "images/btn8on.gif"; 
  
  but17 = new Image(160,22) ;
  but17.src = "images/btn9.gif";
  but18 = new Image(160,22) ;
  but18.src = "images/btn9on.gif"; 

  but19 = new Image(160,22) ;
  but19.src = "images/btn10.gif";
  but20 = new Image(160,22) ;
  but20.src = "images/btn10on.gif"; 
  
  but21 = new Image(160,22) ;
  but21.src = "images/btn11.gif";
  but22 = new Image(160,22) ;
  but22.src = "images/btn11on.gif"; 


  }
  
   
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")
}