var maxImgId = 17;


function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
    	if (oldonload) {
    	  oldonload();
    	}
    	func();
    }
  }
}

function teaserImage() 
{
var tgt = document.getElementById('teaser');
	var pic = Math.floor(Math.random()*maxImgId) + 1;
	tgt.style.backgroundImage = "url(/fileadmin/uk_template_2010/_img/wdhz/wdhze_header"+pic+".jpg)";
}

addLoadEvent(teaserImage);