function swapPic()
     {
     if(document.getElementById)
                 {
               var thePicture=document.getElementById("container");
               var picPath="images/randompic/pic"+rnd(3)+".jpg";
             
			thePicture.style.background="url("+picPath+")";
			  
                 }
     }
     
function rnd(n)
     {
     return Math.floor(Math.random() * n) + 1;
     }