function preload(images) { 
    if (typeof document.body == "undefined") return; 
    try { 
        var div = document.createElement("div"); 
        var s = div.style; 
        s.position = "absolute"; 
        s.top = s.left = 0; 
        s.visibility = "hidden"; 
        document.body.appendChild(div); 
        div.innerHTML = "<img src=\"" + images.join("\" /><img src=\"") + "\" />"; 
    } catch(e) { 
        // Error. Do nothing. 
    } 
} 
preload([ 
    'images/concordweb.png', 
    'images/concordnet.png',
    'images/h_wr_logo.jpg',
    'images/concordweb_l.png', 
    'images/concordnet_l.png'
    'images/concordnet_l.png'

]);