var imagecache = new Array()

var images = new Array(
'http://www.smart.be//images/backgrounds/yellow.gif',
'http://www.smart.be//images/backgrounds/red.gif',
'http://www.smart.be//images/backgrounds/blue.gif',
'http://www.smart.be//images/backgrounds/green.gif'
);

function preload(){
  for( i=0; i<images.length; i++ ) {
    imagecache[i] = new Image();
    imagecache[i].src = images[i];
  }
}

window.onload = preload;