if ( parseInt(navigator.appVersion) >= 4 || navigator.appName == "Netscape") {
kurse_on = new Image();
kurse_on.src = "/oberwart/images/Button_kurse_on.jpg";
kurse_off = new Image();
kurse_off.src = "/oberwart/images/Button_kurse.jpg";
news_on = new Image();
news_on.src = "/oberwart/images/Button_news_on.jpg";
news_off = new Image();
news_off.src = "/oberwart/images/Button_news.jpg";
start_on = new Image();
start_on.src = "/oberwart/images/Button_start_on.jpg";
start_off = new Image();
start_off.src = "/oberwart/images/Button_start.jpg";
home_on = new Image();
home_on.src = "/oberwart/images/Button_home_on.jpg";
home_off = new Image();
home_off.src = "/oberwart/images/Button_home.jpg";
}

var ausgewaehlt="";
var highlighted="";

function doClick(buttonname)
{
   if ( parseInt(navigator.appVersion) >= 4 || navigator.appName == "Netscape")
   {
      bildOn = eval(buttonname + "_on.src");
      if (ausgewaehlt != "")
       {
        bildOff = eval(ausgewaehlt + "_off.src");
       }
      if (buttonname != ausgewaehlt) 
       {
         document[buttonname].src = bildOn;
         if (ausgewaehlt != "")
           {
            document[ausgewaehlt].src = bildOff;
           }
       }
       ausgewaehlt = buttonname;
   }
}

function knopf_on(buttonname)
{
   if ( parseInt(navigator.appVersion) >= 4 || navigator.appName == "Netscape")
   {
      bildOn = eval(buttonname + "_on.src");
      bildOff = eval(buttonname + "_off.src");
      if (buttonname != ausgewaehlt) 
       {
        document[buttonname].src = bildOn;
       }
      if (highlighted != ausgewaehlt && highlighted != buttonname) 
       {
        document[buttonname].src = bildOff;
       }
      highlighted = buttonname;
   }
}
function knopf_off(buttonname)
{
   if ( parseInt(navigator.appVersion) >= 4 || navigator.appName == "Netscape")
   {
     bildOff = eval(buttonname + "_off.src");
     if (highlighted != ausgewaehlt) 
       {
        document[buttonname].src = bildOff;
       }
     highlighted = ausgewaehlt;
   }
}