/**
  Copyright (c) 2008 National Cancer Institute (NCI)
  All Rights Reserved.

  cmn

  $Revision: 1.4 $
  $Author: chuangenc $
**/

/**********************************************************************************
	File Name	:	display.js
	Purpose		:	This javascript controls the display of items on the page.
	Explanation	:	
	Create Date	:	September 12, 2007
	Created By	:	Chuang Enoch	
***********************************************************************************/

function toggle(field, elementId) {
	var element, visual;

	if (document.getElementById)
		element = document.getElementById(elementId);
	else if (document.all)
		element = document.all[elementId];
	else if (document.layers)
    	element = document.layers[elementId];

	if (field.value == "+")
		field.value = "-";
	else
		field.value = "+";
		
	visual = element.style;
  	if (visual.display=='' && element.offsetWidth!=undefined && element.offsetHeight!=undefined)
		visual.display = (element.offsetWidth!=0 && element.offsetHeight!=0)? 'block' : 'none';
	visual.display = (visual.display=='' || visual.display=='block')? 'none' : 'block';
}
	
function show(elementId) {
	var element, visual;

	if (document.getElementById)
		element = document.getElementById(elementId);
	else if (document.all)
		element = document.all[elementId];
	else if (document.layers)
    	element = document.layers[elementId];
    	
   	visual = element.style;
	visual.display = 'block';  
}
	
function hide(elementId) {
	var element, visual;

	if (document.getElementById)
		element = document.getElementById(elementId);
	else if (document.all)
		element = document.all[elementId];
	else if (document.layers)
    	element = document.layers[elementId];

	visual = element.style;    	
	visual.display = 'none'; 
}