var slotNo=1;
var noSwitch=false;
function pause(){
    noSwitch=true;
}
function resume(){
    noSwitch=false;
}
function getAdContainer(adSlot){
    var slotId = 'slot'+(Number(adSlot)+1);
    var cont = document.getElementById(slotId);
    return cont;
}
function hidePreviousAd(){
    var adContainer=null;
    if (slotNo>0){
        adContainer=getAdContainer(slotNo-1);
    } else {
        adContainer=getAdContainer(ads.length-1);
    }
    if(adContainer!=null&&adContainer!='undefined'){
        adContainer.style.display='none';
    }
}
function timedRotation(){
    if (noSwitch){
        return;
    }
    rotateAd();
}
function rotateAd(){
    var adContainer = getAdContainer(slotNo);
    if (adContainer!=null&&adContainer!='undefined'){
        if(adContainer.innerHTML==null||adContainer.innerHTML==''){
            var url='/ad/' + ads[slotNo] + '/htmlslot.htm';
            new net.ContentLoader(url, displayAd);
        } else {
            hidePreviousAd();
            adContainer.style.display="inline";
            incrementSlot();
        }
    }
}
function incrementSlot() {
    if (slotNo<ads.length-1){
        slotNo++;
    } else {
        slotNo=0;
    }
}
function displayAd(){
    var adContainer=null;
    adContainer = getAdContainer(slotNo);
    if (adContainer!=null&&adContainer!='undefined'){
        adContainer.innerHTML=this.req.responseText;
        addStyle(ads[slotNo]);
        hidePreviousAd();
        adContainer.style.display="inline";
        incrementSlot();
    }
}
function addStyle(adId){
    var h=document.getElementsByTagName('head');
    if(h!=null&&h!='undefined'&&h.length==1)
    {
        var adStyle=document.createElement('link');
        adStyle.setAttribute('type', 'text/css');
        adStyle.setAttribute('href', '/ad/' + adId + '/style.css');
        adStyle.setAttribute('rel', 'stylesheet');       
        h[0].appendChild(adStyle);
    }
}