function showhide(layerid,imageid,arrow)
{
	var layer = document.getElementById(layerid); 
	var imgobj = document.getElementById(imageid); 

	if(layer == null) 
		return false; 
		
	if(layer.style.display == 'none') 
	{ 
		layer.style.display= 'block';
		
		if(imgobj != null) 
		{
			if(arrow == null)
				imgobj.src = '/images/collapse.gif';
			else
				imgobj.src = '/images/icons/small_arrow_up.png';
		}
	} 
	else 
	{ 
		layer.style.display = 'none';
	
		if(imgobj != null) 
		{
			if(arrow == null)
				imgobj.src = '/images/expand.gif'; 
			else
				imgobj.src = '/images/icons/small_arrow_down.png';
		}
	} 
	
	return true;
}