var waitTime=7000; /* milliseconds */
var ad_allowed=1;
function refreshAds(){
    var arrElements = document.getElementsByTagName("iframe");
    var oRegExp = new RegExp("(^|\\s)" + "madison_ad" + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];
        if(oRegExp.test(oElement.className)){
            if(ad_allowed==1)
            {
               oElement.src=oElement.src;
               tmp=setTimeout('allowAd()', waitTime);
               try {
	          adRefreshPing();
	       } catch(e) {}
            }
            
        }
    }
    ad_allowed=0;
}
function allowAd() {
   ad_allowed = 1;
}