// Copyright © 2000 by Apple Computer, Inc., All Rights Reserved.
//
// You may incorporate this Apple sample code into your own code
// without restriction. This Apple sample code has been provided "AS IS"
// and the responsibility for its operation is yours. You may redistribute
// this code, but you are not permitted to redistribute it as
// "Apple sample code" after having made changes.
//
// ************************
// layer utility routines *
// ************************

function getStyleObject(objectId) {
    // cross-browser function to get an object's style object given its id
    if(document.getElementById && document.getElementById(objectId)) {
	// W3C DOM
	return document.getElementById(objectId).style;
    } else if (document.all && document.all(objectId)) {
	// MSIE 4 DOM
	return document.all(objectId).style;
    } else if (document.layers && document.layers[objectId]) {
	// NN 4 DOM.. note: this won't find nested layers
	return document.layers[objectId];
    } else {
	return false;
    }
} // getStyleObject

function changeObjectVisibility(objectId, newVisibility) {
	// alert("from function call "+newVisibility);

    // get a reference to the cross-browser style object and make sure the object exists
    var styleObject = getStyleObject(objectId);
    
    if(styleObject) {
    	// alert("current:"+styleObject.display);
    	// if (styleObject.display=='block') { newVisibility='none'; }
    	// else { newVisibility='block'; }
    	if (styleObject.display=='none') { newVisibility='block'; }
    	else { newVisibility='none'; }
    	
		styleObject.display = newVisibility;
		// return true;
	
    } else {
	// we couldn't find the object, so we can't change its visibility
	return false;
    }
} // changeObjectVisibility