function toggleVideo(idNum)
            {
                // Close all but the current video by default
                for(var i=1; i<=9; i++)
                {
                    var c = document.getElementById("v" + i + "Content");
                    var b = document.getElementById("v" + i + "Button");
                   
                    if (i != idNum && c != null && c.style.display != 'none')
                    {
                        c.style.display = 'none';
                        b.src = b.src.replace("collapse", "expand");
                    }
                }
               
                // Get the current video content and check its display style
                var vc = document.getElementById("v" + idNum + "Content");
                var vb = document.getElementById("v" + idNum + "Button");
                               
                if ( vc.style.display == 'none')                {
                    // Expand
                    vc.style.display = 'block';
                    vb.src = vb.src.replace("expand", "collapse");   
                }
                else
                {
                    // Collapse
                    vc.style.display = 'none';
                    vb.src = vb.src.replace("collapse", "expand");                   
                }
               
                return false;
            }