function hidediv(id) {
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
}

function showdiv(id) {
	//safe function to show an element with a specified id
		  
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'block';
		}
		else { // IE 4
			document.all.id.style.display = 'block';
		}
	}
}

function minplus(obj_id, id_of_div) {
var za_obj = document.getElementById(obj_id);
var za_obj2 = document.getElementById(id_of_div);
	if (za_obj.innerHTML=="[-]") {
		za_obj.innerHTML="[+]";
		hidediv(za_obj2);
	} else {
		za_obj.innerHTML="[-]";
		showdiv(za_obj2);
	}
}