/*  Change the visibility of an object on and off. 
 *
 *  <dt onClick="blocking('idtag')"> ...
 *     <dd class="noshow" id="idtag"> ...
 *
 *  In this case, "noshow" is a style that starts the element as invisible.
 */

function swapdisplay(tag)
{
	var tagA = tag + "a"
	var tagB = tag + "b"

	// Get the current state of element A
	if (document.getElementById) //  Netscape, Mozilla, etc.
	{
		var state = document.getElementById(tagA).style.display;
	}
	else if (document.all)      //  IE, Konqueror, etc.
	{
		var state = document.all[tagA].style.display;
	}

	//set initial state of both items
	var newStateA = "";
	var newStateB = "";

	// decide what the new state will be, based on the current state of element "A"
	if ( state == "block")
	{
		newStateA = "none";
		newStateB = "block";

	} else {
		newStateA = "block";
		newStateB = "none";
	}

	// change both the states, method depends on browser
	if (document.getElementById)
	{
		document.getElementById(tagA).style.display = newStateA;
		document.getElementById(tagB).style.display = newStateB;
	}
	else if (document.all)
	{
		document.all[tagA].style.display = newStateA;
		document.all[tagB].style.display = newStateB;
	}
}