//var INTERVAL_SECONDS = 50000;

function changeBanner() //banner changer function
{   
    if(counter > max - 1)
    {     
        counter = 0;
    }

    var jsBanner = document.getElementById('jsBanner');
    jsBanner.src = arrImages[counter].src;
    
    var jsAnchor = document.getElementById('jsAnchor');
    jsAnchor.innerHTML = arrCallToAction[counter];
    jsAnchor.href = arrUrl[counter];

    var jsSpan = this.document.getElementById('jsSpan');
    jsSpan.innerHTML = arrSummary[counter];

    counter++; //increase the counter for the next banner
}

//calls the changeBanner() function every 5 seconds
//change the timer as necessary (minutes * 60000) or (seconds * 1000)
var timer = window.setInterval('changeBanner()', INTERVAL_SECONDS * 1000);
changeBanner();