<!--
function na_hide_layer(lname)
{
  if (document.layers)
    document.layers[lname].visibility = 'hide'    
  if(document.all)
    document.all(lname).style.visibility = 'hidden' 
}

function na_show_layer(lname)
{
  if(document.layers)
    document.layers[lname].visibility = 'show'   
  if(document.all)
    document.all(lname).style.visibility = 'visible' 
}

function na_open_window(name, url, left, top, width, height, toolbar, menubar, statusbar, scrollbar, resizable)
{
  toolbar_str = toolbar ? 'yes' : 'no';
  menubar_str = menubar ? 'yes' : 'no';
  statusbar_str = statusbar ? 'yes' : 'no';
  scrollbar_str = scrollbar ? 'yes' : 'no';
  resizable_str = resizable ? 'yes' : 'no';
  window.open(url, name, 'left='+left+',top='+top+',width='+width+',height='+height+',toolbar='+toolbar_str+',menubar='+menubar_str+',status='+statusbar_str+',scrollbars='+scrollbar_str+',resizable='+resizable_str);
}
// -->