function showhide(element)  
{  
	var item = null;  
	if (document.getElementById)  
	{  
		item = document.getElementById(element);  
	}  
	else if (document.all)  
	{  
		item = document.all[element];  
	}  	
	else if (document.layers)  
	{  
		item = document.layers[element];  
	}
	
	if (!item)  
	{  
		alert('Warning: Element does not exist')
	}  
	else if (item.style)  
	{  
		if (item.style.display == "none")  
		{  
			item.style.display = "block";  
		}
		else  
		{  
			item.style.display = "none";  
		}  
	}  
	else  
	{  
		item.visibility = "show";  
	}  
}