function getElement(id) {
	if (document.getElementById) {
		return (document.getElementById(id));
	} else if (document.all) {
		return (document.all[id]);
	} else {
		if ((navigator.appname.indexOf("Netscape") != -1) && parseInt(navigator.appversion == 4)) {
			return (document.layers[id]);
		}
	}
}

function show_hide(id) {
	element = getElement(id);
	if(element.style) {
		if(element.style.display == 'block' ) {
			element.style.display = 'none';
		} else {
			element.style.display = 'block';
		}
	}
}