var randomnumber=Math.floor(Math.random()*7)
var image="./images/middlebg"+randomnumber+".jpg";
//alert (image);
$(document).ready(function(){
      $("#bodypart").css({ "background-image":"url("+image+")"});
})

function PopupCenter(pageURL, title,w,h) {
var left = (screen.width/2)-(w/2);
var top = (screen.height/2)-(h/2);
var targetWin = window.open (pageURL, title, 'addressbar=no, toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width='+w+', height='+h+', top='+top+', left='+left);
}