function randomAdvert(img_name,img_src) 
{
	var adarray=["1707", "1709", "1707", "1709"];
	var rannum = Math.random()*4;
	rannum = Math.round(rannum);
	if (rannum>3) { rannum=0; }
	var adurl = 'http://adverts.lrfairplay.com/getadvert.imgw?id='+adarray[rannum];
	document["Advert"].src=adurl;
}