// store an interval in a variable
var pause = 6000;
// create and initialise counter
var n = 0;
// create and array of image file names
var imgs1 = new Array ( "images/advertsmall.jpg",
                        "images/dlacysmall.jpg"); 

var imgs2 = new Array ( "images/orlandosmall.jpg",
                        "images/advertsmall.jpg" );

// preload all images
var preload1 = new Array();
for( var i = 1; i < imgs1.length; i++ )
{
  preload1[i] = new Image();
  preload1[i].src = imgs1[i];
}
var preload2 = new Array();
for( var i = 1; i < imgs2.length; i++ )
{
  preload2[i] = new Image();
  preload2[i].src = imgs2[i];
}


// a function to display each image for the set interval



function rotate()
{
var rand1 = Math.floor(Math.random() * imgs1.length)

  document.images.pic1.src = imgs1[rand1];
  document.images.pic2.src = imgs2[rand1];

  setTimeout( "rotate()", pause );
}

// specify the onload event-handler
window.onload = rotate;