//* Open url in a new centered window                            *
//* -------------------------------------------------------------*
//* url - url of page to open                                    *
//* w   - width of new window                                    * 
//* h   - height of new window                                   *
//* [scrollbars] - optional, yes to display scrollbars else no   *
//* [status] - optional, yes to show the browser status else no  *
//* [name] - optional, name of the new window                    *
//****************************************************************
function openCenter(url, w, h, scrollbars, status, name, resizable)
{
       var height = h;
       var width = w;
       var top = screen.height / 2 - height / 2;
       var left = screen.width / 2 - width / 2;

       if(scrollbars == null)
          scrollbars = "yes";
       if(status == null)
          status = "yes";
       if(name == null)
          name = "cWindow";  
       if(resizable == null)
          resizable = "no";     
       
       var browserString = "status=" + status + ",resizable=" + resizable + ",toolbar=no,directories=no,location=no,scrollbars=" + scrollbars + ",width=" + width + ",height=" + height + ",top=" + top + ",left=" + left;
       cWindow = window.open(url, name, browserString);     
}