How to refresh leadbotl banner

[NokFrt]

I want to show Leadboalt ads in my game. According to Leadbolt: Ads are served only when the javascript code is loaded, the ad will not be refreshed until the javascript code is loaded again. 

I wrote the following code to load the ads, but it doesn't work - I don't see any ads, it looks like I can't load javascript dynamically. Can you please someone tell me what could be wrong with my code? If I put the leadbolt script directly into the ads_container (div) in index.html then a banner is displayed, but I don't know how to refresh it.

function showAdsBanner(aPos, aSrc, aRefreshRate)

{

    var adsContainer = document.getElementById("ads_container");           

    adsContainer.style.top = aPos + "px";  

    adsContainer.style.display = "block";


    var script = document.getElementById("ads_banner");


    if (script)

        document.removeChild(script);


    script = document.createElement("script");

    script.id = "ads_banner";

    script.type = "text/javascript";

    script.src = "http://ad.leadboltmobile.net/show_app_ad.js?section_id=485846630";    

    adsContainer.appendChild(script);


...

}

[Quetzacotl]

Check if script onLoad callback is called.