browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
   version = "no";
   if (browserName == "Netscape" && browserVer >= 3) version = "ok";
   if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "ok";

if (version == "ok")
{
  clicked = "";
  prev = "";

  button1on = new Image();
  button1on.src = "bocz002.gif";
  button1off = new Image();
  button1off.src = "bocz002a.gif"; 
  button1 = new Image();
  button1.src = "bocz002a.gif";

  button2on = new Image();
  button2on.src = "bocz004.gif";
  button2off = new Image();
  button2off.src = "bocz004a.gif";
  button2 = new Image();
  button2.src = "bocz004a.gif";

  button3on = new Image();
  button3on.src = "bocz008.gif";
  button3off = new Image();
  button3off.src = "bocz008a.gif";
  button3 = new Image();
  button3.src = "bocz008a.gif";

  button4on = new Image();
  button4on.src = "bocz010.gif";
  button4off = new Image();
  button4off.src = "bocz010a.gif";
  button4 = new Image();
  button4.src = "bocz010a.gif";
    
 }



function select(imgName) 

{  if (version == "ok")
  { imgOn = eval(imgName + "off.src");
    document [imgName].src = imgOn;
  }
}

function deselect(imgName) 
{ if (version == "ok"){
	
if (clicked == "button10" || clicked == "button11" || clicked == "button12")
		{imgOff = eval(imgName + "on.src");
   		document [imgName].src = imgOff;
		
		if (prev != "") {imgOff = eval(prev + "on.src");
   							document [prev].src = imgOff;}	
		
		clicked = "";
		prev = ""	;
	
		}
else	{
	if (imgName == clicked)
      {imgOff = eval(imgName + ".src");
   		document [imgName].src = imgOff;
		
  		if (prev != "") {imgOff = eval(prev + "on.src");
					   		document [prev].src = imgOff;}
  		}
	else
		{imgOff = eval(imgName + "on.src");
   		document [imgName].src = imgOff;
		}
	}
}
}

function chosen(imgName) 
{ if (version == "ok"){
 	prev = clicked;
	clicked = imgName;
}
}