function toggleLayer( whichLayer, whichStyle )
{
	var elem, vis;
	if( document.getElementById ) // this is the way the standards work
		elem = document.getElementById( whichLayer );
	else if( document.all ) // this is the way old msie versions work
		elem = document.all[whichLayer];
	else if( document.layers ) // this is the way nn4 works
		elem = document.layers[whichLayer];
	
	vis = elem.style;
	vis.display = whichStyle;
}

function OnOffLayer(layerID)
{
	if(document.getElementById(layerID))
	{			
		if(document.getElementById(layerID).style.display == 'block')
		{			
			document.getElementById(layerID).style.display = 'none';
		}
		else
		{			
			document.getElementById(layerID).style.display = 'block';
		}
	}
}

function switchtab(set,id){	
	var sets = document.getElementsByTagName("div");
	for (var i = 0; i < sets.length; i++)
	{
		if (sets[i].id.indexOf(set+"_") != -1){				
			if(sets[i].id == set + "_" + id ){				
				toggleLayer(sets[i].id,'block');
				if(document.getElementById(sets[i].id + "_tab"))
				{
					document.getElementById(sets[i].id + "_tab").className = 'active';
				}
			}else{				
				toggleLayer(sets[i].id,'none');
				if(document.getElementById(sets[i].id + "_tab"))
				{
					document.getElementById(sets[i].id + "_tab").className = '';
				}
			}			
		}
	}
}