function	hideAll(useClass) {
	var elems = $$('.' + useClass);
	elems.each(function(elem) {
		Element.hide(elem);
	});	
}

function	showAll(useClass) {
	var elems = $$('.' + useClass);
	elems.each(function(elem) {
		elem.show();
	});	
}

function wdPopup(myURL,dsWinW,dsWinH,dsWinName) {
	var chasm = screen.availWidth;
	var mount = screen.availHeight;
	var dispWindow = window.open(myURL,dsWinName,'width=' + dsWinW + ',height=' + dsWinH + ',left=' + ((chasm - dsWinW - 10) * .5) + ',top=' + ((mount - dsWinH - 30) * .5) + ',scrollbars=yes,resizable=yes');
}	

function validate_required(field,alerttxt) {
	with (field) {
		if (value==null||value=="") {
			alert(alerttxt);return false;
		} else {
			return true;
		}
	}
}