function groupworld_object(width, height)
{
    var agt=navigator.userAgent.toLowerCase();
    var is_nav  = (agt.indexOf('mozilla') != -1);
    var is_ie = (agt.indexOf("msie") != -1);
    var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
    var is_linux = (agt.indexOf("inux")!=-1);
    if ((! is_win) && (! is_linux))
    {
        alert('GroupWorld.net currently only runs on Windows and Linux');
    }
    else
    {
        if (is_ie)
        {
            document.writeln('<OBJECT ID="GroupWorld" WIDTH=',width,' HEIGHT=',height,' CODEBASE="groupworld.cab#Version=1,0,0,45" CLASSID="CLSID:AF14429C-D85A-40F3-AE1C-ADC75429A472"><PARAM NAME="_StockProps" VALUE="0"><p><b>GroupWorld.net control not initialised.</b><br>Note that GroupWorld.net only works on Internet Explorer on Windows. If using XP, you must click on the security link at the top of the web page (where it says "click here to install").</OBJECT>');
        }
        else if (is_nav)
        {
            document.writeln('<embed name="GroupWorld" type="application/groupworld-plugin" width=',width,' height=',height,' pluginspage=plugin.html>');
        }
        else
        {
            alert('Your browser is not supported: please use Internet Explorer, Mozilla, Netscape or Firefox');
        }
    }
}