function schrijfTag(site, size, ord, ptile){
	if (ptile != -1){
		var tag = '<script language="JavaScript1.1" src="http://ad.be.doubleclick.net/adj/' + site + ';ptile=' + ptile +';sz=' + size +';dcopt=ist;ord=' + ord + '?" type="text/javascript"><\/script>';
	}
	else{
		var tag = '<script language="JavaScript1.1" src="http://ad.be.doubleclick.net/adj/' + site + ';sz=' + size +';dcopt=ist;ord=' + ord + '?" type="text/javascript"><\/script>';
	}
	return tag;
}