/**
 * Start functions onload of document
 */
$(function() {
    init_fader('headerimage', 8000, 2000);
});

/**
 * initialize fader and start if element was found
 *
 * @param string ElementId
 */
function init_fader(ElementId, Interval, Speed)
{
    var newsitems;
    var curritem=0;

    var ElementSponsor = $("#"+ElementId);
    if (typeof ElementSponsor == 'object') {
        newsitems = $("#"+ElementId+" li").hide().size();
        $("#"+ElementId+" li:eq("+curritem+")").show();
        setInterval(function(){sponsorfade(ElementId);}, Interval); //time in milliseconds
    }

    function sponsorfade(ElementId) {
        $("#"+ElementId+" li:eq("+curritem+")").fadeOut(Speed);
        curritem = ++curritem%newsitems;
        $("#"+ElementId+" li:eq("+curritem+")").fadeIn(Speed);
    }
}