function swap() {
var numimages=10;
rndimg = new Array
("../imgs/left.jpg","../imgs/left1.jpg", "../imgs/left2.jpg", 
"../imgs/left3.jpg", "../imgs/left4.jpg","../imgs/left5.jpg", "../imgs/left6.jpg",
"../imgs/left7.jpg", "../imgs/left8.jpg","../imgs/left9.jpg");
rndimg1 = new Array
("../imgs/middle.jpg", "../imgs/middle0.jpg","../imgs/middle1.jpg", "../imgs/middle2.jpg", 
"../imgs/middle3.jpg", "../imgs/middle4.jpg","../imgs/middle5.jpg", 
"../imgs/middle7.jpg", "../imgs/middle8.jpg","../imgs/middle9.jpg");
rndimg2 = new Array
("../imgs/right.jpg", "../imgs/right0.jpg","../imgs/right1.jpg", "../imgs/right2.jpg", 
"../imgs/right3.jpg", "../imgs/right4.jpg","../imgs/right5.jpg", "../imgs/right6.jpg",
"../imgs/right7.jpg", "../imgs/right8.jpg");
x=(Math.floor(Math.random()*numimages));
x1=(Math.floor(Math.random()*numimages));
x2=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
randomimage1=(rndimg1[x1]);
randomimage2=(rndimg2[x2]);
document.getElementById("imgLeft").style.backgroundImage = "url("+ randomimage +")"; 
document.getElementById("imgMiddle").style.backgroundImage = "url("+ randomimage1 +")";
document.getElementById("imgRight").style.backgroundImage = "url("+ randomimage2 +")"; 
}
if (document.getElementById) { window.onload = swap };
//-->