var backgroundSrcs = new Array(4) 
backgroundSrcs[0]="cullurio.jpg"; 
backgroundSrcs[1]="Eschoenichus.jpg";
backgroundSrcs[2]="himantopus.jpg"; 
backgroundSrcs[3]="LeftStork.jpg"; 

var MainPicSrcs = new Array(4) 
MainPicSrcs [0]="3Girls.jpg"; 
MainPicSrcs [1]="AccordianMan.jpg";
MainPicSrcs [2]="OneGirl.jpg"; 
MainPicSrcs [3]="TwoWomen.jpg"; 

function pick_random_image() 
{ 
var elem
var bgimage=backgroundSrcs[(Math.round(Math.random()*(backgroundSrcs.length-1)))]
elem = document.getElementById("container");
elem.style.backgroundImage = "url('images/LeftCollection/" +bgimage + "')"; 
} 

function pick_random_main_image() 
{ 
var elem
var bgimage=MainPicSrcs[(Math.round(Math.random()*(MainPicSrcs.length-1)))]
elem = document.getElementById("MainPic");
elem.src = "images/MainPageRotate/" + bgimage; 
}
 pick_random_image();
 pick_random_main_image();