function hdr_ref(object) {
	if (document.getElementById) {
		return document.getElementById(object);
	} else if (document.all) {
		return eval('document.all.' + object);
	} else {
		return false;
	}
}

function hdr_expand(object) {
	var object = hdr_ref(object);

	if( !object.style ) {
		return false;
	} else {
		object.style.display = '';
	}

	if (window.event) {
		window.event.cancelBubble = true;
	}
}

function hdr_contract(object) {
	var object = hdr_ref(object);

	if( !object.style ) {
		return false;
	} else {
		object.style.display = 'none';
	}

	if (window.event) {
		window.event.cancelBubble = true;
	}
}

function hdr_toggle(object, open_close, open_icon, close_icon) {
	var object = hdr_ref(object);
	var icone = hdr_ref(open_close);

	if( !object.style ) {
		return false;
	}

	if( object.style.display == 'none' ) {
		object.style.display = '';
		icone.src = close_icon;
	} else {
		object.style.display = 'none';
		icone.src = open_icon;
	}
}