// script fuer Ein- und Ausblenden der Layers auf der Startseite
function showHideTextLayer(xy)
{
	if (document.getElementById(xy).style.visibility == "visible")
	{
	  document.getElementById(xy).style.visibility = "hidden";
	  return;
	}
	if (document.getElementById(xy).style.visibility == "hidden")
	{
	  document.getElementById(xy).style.visibility = "visible";
	  return;
	}
}


// rollover
function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    contact_2 = newImage("images/navi/contact_2.gif");
    further_information_2 = newImage("images/navi/further_information_2.gif");
    ibc_2 = newImage("images/navi/ibc_2.gif");
    impressum_2 = newImage("images/navi/impressum_2.gif");
    meet_ibc_2 = newImage("images/navi/meet_ibc_2.gif");
    programme_introduction_2 = newImage("images/navi/programme_introduction_2.gif");
    programme_organisation_2 = newImage("images/navi/programme_organisation_2.gif");
    programme_structure_2 = newImage("images/navi/programme_structure_2.gif");
    preloadFlag = true;
  }
}