var openTab;

            function switchTabs(tab) 
            {
                if(tab != openTab) 
                {
                    // highlight tab

                    document.getElementById(tab).style.display = "block";
                    document.getElementById(tab + "_tab").src = "images/tab_" + tab + "_o.png";

                    // hide previous content

                    if(openTab != null) 
                    {
                        document.getElementById(openTab).style.display = "none";
                        document.getElementById(openTab + "_tab").src = "images/tab_" + openTab + ".png";
                    }

                    // redirect to youtube if video and on iphone

                    if(tab == "video") 
                    {
                        var ua = navigator.userAgent ;
                        var img = document.getElementById("videocover");

                        //if (ua.indexOf("iPhone") > 0) 
                        if(navigator.userAgent.match(/(ipad|iphone)/gi))
                        {
                            document.getElementById('video_youtube').style.display = 'block';
                        }
                        else 
                        {
                            document.getElementById('video_flash').style.display = 'block';
                        }
                    }

                    openTab = tab;
                    window.location.hash = tab;
                }
            }

    var openImage = 0;

    function switchImage() {
        var images = new Array("screen1.jpg", "screen2.jpg", "screen3.jpg", "screen4.jpg", "screen5.jpg");
        var c = document.getElementById('imageContainer');

        openImage++;

        if(openImage >= images.length) openImage = 0;

        c.src = 'screenshots/' + images[openImage];
    }