function popup(url,w,h,target,scroll) 
 {
 str ="width="+w+",height="+h+",status=1,toolbar=no,menubar=no,scrollbars="+scroll;
 myWin = open(url, target, str);
 }

function show_box(box)
 {
 hide_boxes()
 box.className = "box box_on"
 }

function hide_boxes()
 {
 tds = document.getElementsByTagName("td")
 for (i=0;i<tds.length;i++)
  {
  if (tds[i].getAttribute("group")=="box")
   {
   tds[i].className="box box_off"
   }
  }
 }