//*** This code is copyright 2003 by Gavin Kistner, gavin@refinery.com
//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt
//*** Reuse or modification is free provided you abide by the terms of that license.
//*** (Including the first two lines above in your source code satisfies the conditions.)

// Returns true if the element is hidden (display:none or visibility:hidden)
function IsHidden(el){
	var vis;
	while (el!=null){
		if ((vis=CurrentStyle(el,'visibility'))=='visible') return false;
		if (CurrentStyle(el,'display')=='none' || vis=='hidden')	return true;
		el=el.parentNode;
	}
	return false;
}

// Requires CurrentStyle() -- see http://phrogz.net/JS/CurrentStyle_js.txt