function preloader() 
{

     // counter
     var i = 0;

     // create object
     imageObj = new Image();

     // set image list
     images = new Array();
     images[0]="../images/slide6.png"
     images[1]="../images/slide4.png"
     images[2]="../images/slide7.png"
     images[3]="../images/slide2.png"

     // start preloading
     for(i=0; i<=3; i++) 
     {
          imageObj.src=images[i];
     }

}