function rtrShow(id, buttonId)
{
	element = document.getElementById(id);
	buttonElement = document.getElementById(buttonId);
	
	if ( !element.style.display || element.style.display == "none" )
	{
		element.style.display = "inline";
		buttonElement.innerHTML = "-";
	} else
	{
		element.style.display = "none";
		buttonElement.innerHTML = "+";
	}
	
    return false;
}