var preload_image_object=new Array();
var image_url=new Array();
    image_url[0]='http://rickmanenterprise.com/en/imgs/p2.jpg';
    image_url[1]='http://rickmanenterprise.com/en/imgs/p3.jpg';
    image_url[2]='http://rickmanenterprise.com/en/imgs/p4.jpg';
    image_url[3]='http://rickmanenterprise.com/en/imgs/p5.jpg';

var i=0;
for(i=0;i<=3;i++){
   preload_image_object[i]=new Image();
   preload_image_object[i].src=image_url[i];
 }