function loadImgs () {
   
   var docroot="images/photos/";
   var randbase;
   var baseimg;
   var swapimg;
   
   randbase = Math.floor(Math.random()*21)
   for (var i=0;i<5;i++) {
      baseimg = randbase + i;
      if (baseimg < 10) {
         baseimg = '0' + baseimg;
      }
      document.images['Image' + i].src = docroot + 'image' + baseimg + '.jpg';
   }
   
   randbase+=5;
   for (var i=0;i<5;i++) {
      swapimg = randbase + i;
      if (swapimg < 10) {
         swapimg = '0' + swapimg;
      }
      preloadPermut('Image' + i, swapimg); 
   }
   
}

function Permut (flag,img) {
   if (document.images) {
        if (document.images[img].permloaded) {
            if (flag==1) document.images[img].src = document.images[img].perm.src
            else document.images[img].src = document.images[img].perm.oldsrc
        }
   }
}

function preloadPermut (img,adresse) {
   var docroot="images/photos/";
   if (document.images) {
        document.images[img].onload = null;
        document.images[img].perm = new Image ();
        document.images[img].perm.oldsrc = document.images[img].src;
        document.images[img].perm.src = docroot + 'image' + adresse + '.jpg';
        document.images[img].permloaded = true;
   }
}