var WindowObjectReference;

function launchDemo(demo)
{
    if(WindowObjectReference == null || WindowObjectReference.closed)
    {
        var w = 880;
        var h = 685;

        var wleft = (screen.width - w) / 2;
        var wtop = (screen.height - h - 95) / 2;
        if (wleft < 0) wleft = 0;
        if (wtop < 0) wtop = 0;
    
        var url = "http://epmconnect.vlabcenter.com/launchdemo.aspx?demo="+demo+"&w="+screen.width;

	    WindowObjectReference = window.open(url, "vlabCenterConsole", "height="+h+",width="+w+",left="+wleft+",top="+wtop+",scrollbars=yes,status=1,resizable=1",true);
    }
    else
    {
	    WindowObjectReference.focus();
    }
}