var aryImgsOn = new Array(5);
 var aryImgsOff = new Array(5);

 aryImgsOn[0] = "images/home_on.gif";
 aryImgsOn[1] = "images/carcamp_on.gif";
 aryImgsOn[2] = "images/accom_on.gif";
 aryImgsOn[3] = "images/parkfacil_on.gif";
 aryImgsOn[4] = "images/contact_on.gif";

 aryImgsOff[0] = "images/home_off.gif";
 aryImgsOff[1] = "images/carcamp_off.gif";
 aryImgsOff[2] = "images/accom_off.gif";
 aryImgsOff[3] = "images/parkfacil_off.gif";
 aryImgsOff[4] = "images/contact_off.gif";

 for (i=0; i < aryImgsOn.length; i++) {
  var preload = new Image();
  preload.src = aryImgsOn[i];
 }
 for (i=0; i < aryImgsOff.length; i++) {
  var preload = new Image();
  preload.src = aryImgsOff[i];
 }

 function swap(imgIndex,NF) {
  if ((NF == "on") && (imgIndex != pageNum)) {
   document[imgIndex].src = aryImgsOn[imgIndex];
   document[pageNum].src = aryImgsOff[pageNum];
  }
  else if ((NF == "off") && (imgIndex != pageNum)) {
   document[imgIndex].src = aryImgsOff[imgIndex];
   document[pageNum].src = aryImgsOn[pageNum];
  }
 }