function showHide(id)
{
 	// assign object to variable
 	var obj = document.getElementById(id);
	
	// check if object exists on page
 	if(obj)
	{
	 		// show or hide object
	 	 	if(obj.style.display == "none")
				obj.style.display = "block";
			else
				obj.style.display = "none";
	}
}