function rollOver( element, button, selected ) {
	element.src = "/images/menu.button." + button + ( selected ? ".selected" : "" ) + ".gif";
}

function rolloverCalendar( element, button, selected ) {
	element.src = "/images/calendar/" + button + ( selected ? ".hover" : "" ) + ".gif";
}

function numericEntry( e ) {
	var k = -1; 
	
	if( e && e.which ) k = e.which;
	else if( window.event && window.event.keyCode ) k = window.event.keyCode; 

	return ( k > 47 && k < 58 ) || k == 8;
}