function getByID (n) {
	var d = window.document;
    if (d.getElementById)
		return d.getElementById(n);
    else if (d.all)
		return d.all[n];
}

function showHide (item) {
	var obj = getByID('show_hide_' + item);
    var lnk_obj = getByID('show_hide_link_' + item);
    if (obj && lnk_obj)
		if (obj.style.display == 'none') {
			obj.style.display = 'block';
            lnk_obj.style.backgroundImage = 'url(/images/arrow_down.gif)';
		} else if (obj.style.display == 'block') {
			obj.style.display = 'none';
            lnk_obj.style.backgroundImage = 'url(/images/arrow_right.gif)';
		}
}