var currentHeaderImage = 0;

function onDocReady()
{
    setInterval(fadeNextImageIn,6000);
}

function fadeNextImageIn()
{
    $("span.tabOn").addClass("tabOff").removeClass("tabOn");
    $("div.tab").fadeOut();
    if ($("#tab_"+currentHeaderImage+"_content").length == 0)
    {
        currentHeaderImage = 0;
    }
    var currentTabJQ = $("#tab_"+currentHeaderImage+"_content");
    currentTabJQ.stop();
    currentTabJQ.fadeIn();
    $("span#tab_"+currentHeaderImage).addClass("tabOn");
    currentHeaderImage += 1;
    
}

$(document).ready(onDocReady);