function openClose(theID)
{
	if (document.getElementById(theID).style.display == "block")
	{
		document.getElementById(theID).style.display = "none";
		document.getElementById("tick_"+theID).innerHTML = "<img src='navtree/images/ad_plus2.gif' border='0' />";
	}
	else
	{
		document.getElementById(theID).style.display = "block";
		document.getElementById("tick_"+theID).innerHTML = "<img src='navtree/images/ad_minus2.gif' border='0' />";
	}
}