function placeMain(){

// Size of the picture to be centered

var picHeight=600;
var picWidth=900;

var pics = new Array(3);
pics[0]="url(img/version-10.jpg)";
pics[1]="url(img/version-10.jpg)";
pics[2]="url(img/version-11.jpg)";


var curPic=pics[Math.floor(pics.length*Math.random())];


document.getElementById("outer_wrapper").style.backgroundImage=curPic;



}