// global variables
var force_menu_section = 0;
///////////////////////////////////
// show and hide horizontal menu //
///////////////////////////////////
function show_menu(id)
{
  for (var i = 1; i<=10; i++)
  {
	if (document.getElementById('tab'+i)) document.getElementById('tab'+i).style.display='none';
  }
  var d = document.getElementById("tab"+id);
  if (d) {d.style.display='block';}
}

function hide_menu()
{
  for (var i = 1; i<=10; i++)
  {
    if (document.getElementById('tab'+i)) document.getElementById('tab'+i).style.display='none';
  }
}

function popup(url) 
{
 var width  = 480;
 var height = 610;
 var left   = (screen.width  - width)/2;
 var top    = (screen.height - height)/2;
 var params = 'width='+width+', height='+height;
 params += ', top='+top+', left='+left;
 params += ', directories=no';
 params += ', location=no';
 params += ', menubar=no';
 params += ', resizable=yes';
 params += ', scrollbars=no';
 params += ', status=no';
 params += ', toolbar=no';
 newwin=window.open(url,'windowname5', params);
 if (window.focus) {newwin.focus()}
 return false;
}