var bNavigator = navigator.userAgent.lastIndexOf('Mozilla') != -1;
var bIE = bNavigator && navigator.userAgent.lastIndexOf('MSIE') != -1;
if (bIE) bNavigator = false;

function show_object( object, bShow)
{
   if( bShow == 0) 
   {
      if (bNavigator)
         object.visibility = "hide";
      else
         object.style.visibility = "hidden";
   }
   else
   {
      if (bNavigator)
         object.visibility = "show";
      else
         object.style.visibility = "visible";
   }
}

function btnOver( sName)
{
    var img;
    img = document.images[sName];

    var sUrl = img.src;
    var Pos = sUrl.lastIndexOf (".");
    var sTyp = Pos < 0 ? "" : sUrl.substr(Pos, 4);

    var Pos = sUrl.lastIndexOf ("/");
    sUrl = Pos < 0 ? "" : sUrl.substring (0, Pos + 1);
    img.src = sUrl + sName + "_o" + sTyp;
}

function btnOut( sName)
{
    var img;
    img = document.images[sName];


    var sUrl = img.src;
    var Pos = sUrl.lastIndexOf (".");
    var sTyp = Pos < 0 ? "" : sUrl.substr(Pos, 4);

    var Pos = sUrl.lastIndexOf ("/");
    sUrl = Pos < 0 ? "" : sUrl.substring (0, Pos + 1);
    img.src = sUrl + sName + sTyp;
}

function zurueck()
{
    if( bNavigator)
        window.back();
    else
        history.back();
}