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



version = "n2";
if ( browserName == "Netscape" && browserVer >= 3 ) version = "n3";
if ( browserName == "Microsoft Internet Explorer" && browserVer >=4 ) 
version = "e4";



if ( version == "n3" || version == "e4" )
{
  blank2 = new Image(106, 68);
  blank2.src = "images/blank.gif";

  one = new Image(106, 68);
  one.src = "images/one.gif";

  two = new Image(106, 68);
  two.src = "images/two.gif";

  three = new Image(106, 68);
  three.src = "images/three.gif";

  four = new Image(106, 68);
  four.src = "images/four.gif";

  five = new Image(106, 68);
  five.src = "images/five.gif";

  six = new Image(106, 68);
  six.src = "images/six.gif";
}

function button_on ( imgName )
{
  if ( version == "n3" || version == "e4" )
  {
    butOn = eval ( imgName + "_on.src" );
    document [imgName].src = butOn;
  }
}

function button_off ( imgName )
{
  if ( version == "n3" || version == "e4" )
  {
    butOff = eval ( imgName + "_off.src" );
    document [imgName].src = butOff;
  }
}