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);
    var is_macosx = (agt.indexOf("mac os x")!=-1);
    if ((! is_win) && (! is_linux) && (! is_macosx))
    {
        alert('GroupWorld.net currently only runs on Windows, Linux and Mac OSX');
    }
    else
    {
        if (is_ie)
        {
            document.writeln('<OBJECT ID="GroupWorld" WIDTH=',width,' HEIGHT=',height,' CODEBASE="/groupworld/html/groupworld_no3d.cab#Version=1,0,0,51" CLASSID="CLSID:AF14429C-D85A-40F3-AE1C-ADC75429A472"></OBJECT>');
        }
        else if (is_macosx)
        {
            document.writeln('<embed name="GroupWorld" type="application/groupworld-plugin" width=',width,' height=',height,' pluginspage=/groupworld/html/groupworld_plugin.dmg>');
        }
        else if (is_nav)
        {
            document.writeln('<embed name="GroupWorld" type="application/groupworld-plugin" width=',width,' height=',height,' pluginspage=/groupworld/html/plugin.html>');
        }
        else
        {
            alert('Your browser is not supported: please use Internet Explorer, Mozilla, Netscape, Firefox or Safari');
        }
    }
}