window.onload = function()
{
    var preload_images_object = [];
    var menu = new Array("home", "company", "approach", "solutions", "benefits", "partners", "contact");
    for (var id in menu)
    {
        var img = document.getElementById(menu[id]);
        img.onmouseover = roll_over;
        img.onmouseout = roll_out;
        preload_images_object[id] = new Image();
        preload_images_object[id].src = "./nav/" + menu[id] + "_on.jpg";
    }
}

var roll_over = function () {this.src = "./nav/" + this.id + "_on.jpg";}
var roll_out  = function () {this.src = "./nav/" + this.id + ".jpg";}

var wopen = function (website, hh, ww)
{
    var winwidth = top.winwidth||screen.availWidth;
    var winheight = top.winheight||screen.availHeight;

    var xpos = (winwidth - ww)/2;
    var ypos = (winheight - hh)/2;

    var sizer = window.open(website, "wopen", "left=" + xpos + ",top=" + ypos + ",height=" + hh + ",width=" + ww + ",scrollbars=no, resizable=no");
}