function preloader() {
     // counter
     var i = 0;
     // create object
     imageObj = new Image();
     // set image list
     images = new Array();
     images[0]="images/banner.jpg";
     images[1]="images/bodyleft.jpg";
     images[2]="images/bodyright.jpg";
     images[3]="images/footer.jpg";
     // start preloading
     for(i=0; i<=3; i++) 
     {
          imageObj.src=images[i];
     }
}