function init()
{
    if (document.getElementById)
    {
        var x = document.getElementsByTagName("img");
    }
    else if (document.all)
    {
        var x = document.all.tags("img");
    }
    else return;

    var preloads = new Object();
    for (var i = 0; i < x.length; i++)
    {
        var nn = x[i].id;
        var index = nn.indexOf("mouseover_");
        if (index == 0)
        {
            var name = nn.substring(10);
            preloads["off" + x[i].id] = new Image;
            preloads["off" + x[i].id].src = "/pics/links/" + name + "_off.gif";
            preloads["on" + x[i].id] = new Image;
            preloads["on" + x[i].id].src = "/pics/links/" + name + "_on.gif";
            x[i].onmouseover = function() { this.src = preloads["on" + this.id].src; }
            x[i].onmouseout = function() { this.src = preloads["off" + this.id].src; }
        }
    }
}