var imageCount = 10;
getHeaderImage();
function getHeaderImage() {
	var index =(Math.floor(Math.random()*imageCount))+1;
	var header = document.getElementById('header');
	var e = document.domain.split(/\./);
	var domain = "";
  if(e.length > 1) {
    domain = e[e.length-2] + "." +  e[e.length-1];
  }	
	if(domain=="") {
		domain="localhost";
	}
	header.style.background="url(http://"+domain+"/img/header"+index+".jpg) top left no-repeat";
}