// Function for preloading images
  function preloadImg(Url) {
    var img = new Image();
    img.src = Url;
    return img;
  }

  // Preload images
  if (document.images) {
    var homeOff  	= preloadImg("graphics/frame_home1.gif");
    var homeOn 	= preloadImg("graphics/frame_home1_over.gif");
	 var welOff 	= preloadImg("graphics/frame_welcome1.gif");
	 var welOn 		= preloadImg("graphics/frame_welcome1_over.gif");
	 var admitOn 	= preloadImg("graphics/frame_crit1_over.gif");
	 var admitOff 	= preloadImg("graphics/frame_crit1.gif");
	 var aimsOn 	= preloadImg("graphics/frame_aims1_over.gif");
	 var aimsOff 	= preloadImg("graphics/frame_aims1.gif");
	 var acurrOn 	= preloadImg("graphics/frame_acurr1_over.gif");
	 var acurrOff 	= preloadImg("graphics/frame_acurr1.gif");
	 var careerOn 	= preloadImg("graphics/frame_career1_over.gif");
	 var careerOff  = preloadImg("graphics/frame_career1.gif");
	 var curricOn 	= preloadImg("graphics/frame_curr1_over.gif");
	 var curricOff  = preloadImg("graphics/frame_curr1.gif");
	 var examOn 	= preloadImg("graphics/frame_exam1_over.gif");
	 var examOff 	= preloadImg("graphics/frame_exam1.gif");
	 var extraOn 	= preloadImg("graphics/frame_extra1_over.gif");
	 var extraOff 	= preloadImg("graphics/frame_extra1.gif");
	 var infoOn 	= preloadImg("graphics/frame_info1_over.gif");
	 var infoOff 	= preloadImg("graphics/frame_info1.gif");
	 var pupilsOff  = preloadImg("graphics/frame_pupils1.gif");
	 var pupilsOn   = preloadImg("graphics/frame_pupils1_over.gif");
	 var guestOff   = preloadImg("graphics/frame_guestbook1.gif");
	 var guestOn    = preloadImg("graphics/frame_guestbook1_over.gif");
	 var messageOff = preloadImg("graphics/frame_message1.gif");
	 var messageOn  = preloadImg("graphics/frame_message1_over.gif");
	 var pastorOn 	= preloadImg("graphics/frame_past1_over.gif");
	 var pastorOff  = preloadImg("graphics/frame_past1.gif");
	 var phyOn 		= preloadImg("graphics/frame_phy1_over.gif");
	 var phyOff 	= preloadImg("graphics/frame_phy1.gif");
	 var staffOn 	= preloadImg("graphics/frame_staff1_over.gif");
	 var staffOff 	= preloadImg("graphics/frame_staff1.gif");
	 var addOn 		= preloadImg("graphics/frame_add1_over.gif");
	 var addOff 	= preloadImg("graphics/frame_add1.gif");
	 var sportOn 	= preloadImg("graphics/frame_sport1_over.gif");
	 var sportOff 	= preloadImg("graphics/frame_sport1.gif");
  }

	// function to swap images
	function swap(theNum, theName){
		if (document.images) document.images[theNum].src = eval(theName+".src");
	}