var alertTimerID = 0;
function swap1() {
    var obj = document.getElementById('headerimage');
    obj.src = "/images/mls_userarea_banner1.jpg";
    obj.setAttribute("useMap","#header1");
    clearTimeout(alertTimerID);
    alertTimerID = setTimeout("swap2()", 6000);
}
function swap2() {
    var obj = document.getElementById('headerimage');
    obj.src = "/images/mls_userarea_banner2.jpg";
    obj.setAttribute("useMap", "#header2");
    clearTimeout(alertTimerID);
    alertTimerID = setTimeout("swap3()", 6000);
}
function swap3() {
    var obj = document.getElementById('headerimage');
    obj.src = "/images/mls_userarea_banner3.jpg";
    obj.setAttribute("useMap", "#header3");
    clearTimeout(alertTimerID);
    alertTimerID = setTimeout("swap4()", 6000);
}
function swap4() {
    var obj = document.getElementById('headerimage');
    obj.src = "/images/mls_userarea_banner4.jpg";
    obj.setAttribute("useMap", "#header4");
    clearTimeout(alertTimerID);
    alertTimerID = setTimeout("swap1()", 6000);
}