var amount = 7;  // Amount of navigation buttons
var number = 0;

ImageCacheOFF = new Array();
ImageCacheMO = new Array();

if (document.images) {
for (i=1; i < amount + 1; i++) {
   ImageCacheOFF[i] = new Image();
   ImageCacheOFF[i].src = "image/main" + i +"-off.gif";
   ImageCacheMO[i] = new Image();
   ImageCacheMO[i].src = "image/main" + i +"-on.gif";
   }
}

function imageMO(base, number, descrip) {
   window.status = descrip;
   main = number;
   if (current == number) {
      return false;
   }
   if (document.images) {       
   document.images['main' + main].src = ImageCacheMO[main].src;
   }
   return true;
}

function imageOFF(base, number)  {
   if ((current == number) && (document.images)) {
   return true;
   }
   main = number;
   if (document.images)
   document.images['main' + main].src = ImageCacheOFF[main].src;
   return true;
}