/*
try
 {
  var el = document.getElementById(id);
  
  if (el)
  {  
   bla
  }
 } catch (e) {}  
 */
 
function MenuOn()
{
	//alert(level1+'.'+level2+'.'+level3);
	//alert(subNav level1+'.'+level2+'.'+level3);

	var el;

	try
	{
		el=document.getElementById('subNav'+level1);
		if(el) el.style.display='block';
	}
	catch (e) {}

	if(level2)
	{
		try
		{
			el=document.getElementById('subNav'+level1+'.'+level2);
			if(el) el.style.display='block';
		}
		catch (e) {}

		if(level3)
		{
			try
			{
				el=document.getElementById('subNav'+level1+'.'+level2+'.'+level3);
				if(el) el.style.display='block';
			}
			catch (e) {}		
		}
	}
}