var thecount = Math.round(Math.random() * 2);

hp_pic1 = new Image();
hp_pic1.src = "homepage_pics/hp_pool.jpg";

hp_pic2 = new Image();
hp_pic2.src = "homepage_pics/hp_commun.jpg";

hp_pic3 = new Image();
hp_pic3.src = "homepage_pics/hp_safety.jpg";

function rotatePic(){
if(thecount==0){
  hp_pic.src = hp_pic1.src;
 }
 if(thecount==1){
  hp_pic.src = hp_pic2.src;
 }
 if(thecount==2){
  hp_pic.src = hp_pic3.src;
 }
}