var nPanel = 1;
var nPanels = 7;
var nOldPanel = 0;
var nStart = null;
var nFadeTime = 2000;
var nHangTime = 7000;
var nHangTimer = null;
        
function autoAdvance() {
    showPanel((nPanel % nPanels) + 1);
    nHangTimer = window.setTimeout('autoAdvance()', nHangTime)
}
nHangTimer = window.setTimeout('autoAdvance()', nHangTime)
        
function fadePanel() {
    var t = getTimer() - nStart;
    if (t < nFadeTime) {
        var p = document.getElementById('idPanel' + nPanel);
        n = Math.round((t / nFadeTime) * 100);
        p.style.opacity = (n / 100);
        p.style.filter = 'alpha(opacity=' + n + ')';
        window.setTimeout('fadePanel()', 20);
    }
    else {
        var p = document.getElementById('idPanel' + nPanel);
        p.style.opacity = '';
        p.style.filter = '';
        var op = document.getElementById('idPanel' + nOldPanel);
        op.style.display = 'none';
    }
}
        
function setPanel(i) {
    if (nHangTimer != null) {
        window.clearTimeout(nHangTimer);
        nHangTimer = null;
    }
    showPanel(i);
    return false;
}
        
function showPanel(i) {
    if (i != nPanel) {
        nStart = getTimer();
        nOldPanel = nPanel;
        nPanel = i;
        for (a = 1; a <= nPanels; a++) {
            var p = document.getElementById('idPanel' + a);
            if (a == nPanel) {
                p.style.opacity = '0.01';
                p.style.filter = 'alpha(opacity=01)';
                p.style.zIndex = 99;
                p.style.display = '';
            }
            else {
                if (a == nOldPanel) {
                    p.style.opacity = '1';
                    p.style.filter = 'alpha(opacity=100)';
                    p.style.zIndex = 2;
                    p.style.display = '';
                }
                else {
                    p.style.display = 'none';
                }
            }
        }
        fadePanel();
    }
}
        
function getTimer() {
    return (new Date()).getTime();
}