//
// Open centered window
//
function open_wnd(exp_bar,width,height,url) {
  winName = "_blank";
  //theURL = 'http://'+url;
  theURL = url;
  page_height = (height != '')?height:600;
  page_width = (height != '')?width:500;
  toolbar = (exp_bar == 1)?'yes':'no';
  page_top = Math.round((screen.height-page_height)/2);
  page_left = Math.round((screen.width-page_width)/2);
  size = "width="+page_width+",height="+page_height+",top="+page_top+",left="+page_left;
    features = 'status=yes,toolbar='+toolbar+',scrollbars=yes,resizable=yes,'+size;
    //var newWnd = null;
    //alert(theURL);
    window.open(theURL,winName,features);
    //newWnd.focus();
}