var is_ie = ((navigator.userAgent.toLowerCase().indexOf("msie") != -1) && (navigator.userAgent.toLowerCase().indexOf("opera") == -1));
function popupwin(name, url)
{
  var width = 800;
  var height = 600;
  var xpos = (screen.width - width)/2;
  var ypos = (screen.height - height)/2;
  w = window.open(url, name,'fullscreen=no,channelmode=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width='+width+',height='+height+',top='+ypos+',left='+xpos); 
  w.focus();
  return false;
}
/*
function menu_item(id)
{

//	var obj = document.getElementById('menu_'+id)
//	if (obj)
//	{
//		obj.style.display = (obj.style.display == 'block')?'none':'block';
//	}
	var i = 0;
	while (obj = document.getElementById('menu_'+i))
	{
		obj.style.display = (i == id)?((obj.style.display == 'block')?'none':'block'):'none';
		i++;
	}
//	obj = document.getElementById('menu_'+id)
//	obj.style.display = 'block';

}
*/

function menu_item(id)
{
	$$('div[id^=menu_]').each(function(el){
		if (el.id == 'menu_' + id)
			el.style.display  = el.style.display == 'block' ?'none':'block'
		else
			el.style.display = 'none';

	})
}