function PreloadImages(urls)
{                   
    for (var i = 0; i <= urls.length; i++) 
    {
        var img = new Image();
        img.src = urls[i];
    }
}

function ToggleSubNavMenu(id)
{
    var contents = document.getElementsByClassName("SubNavContent");
    if (contents.length == 0)
        return;       
      
    var content = document.getElementById(id);
    var state = content.style.display;

    for (var i = 0; i < contents.length; i++)
        contents[i].style.display = "none";       

    if (state == "none")
        content.style.display = "";
        
    scroll(0,0);
}

document.getElementsByClassName = function(cl) 
{
    var retnode = [];
    var myclass = new RegExp('\\b'+cl+'\\b');
    
    var elem = this.getElementsByTagName('*');    
    for (var i = 0; i < elem.length; i++) 
    {
        var classes = elem[i].className;
        if (myclass.test(classes)) retnode.push(elem[i]);
    }
    
    return retnode;
};