function OsOpen(gmOS,sOS,tOS)
{

    if(!window.oswin || window.oswin.closed)
    {
    window.oswin=window.open('http://os.sdo.com/default.aspx?gm='+gmOS+'&intype='+sOS+'&t='+escape(tOS), '', 'toolbar=no,location=no,left='+(window.screen.width - 640) / 2+',top='+(window.screen.height - 480) / 2+',directories=no,scrollbars=no,menubar=no,width=465,height=455,resizable=no,status=no');
    }
    else
    {
        alert('您已经打开了一个对话');
    } 	    
}