function item_selected(){
	total_price = 0
	var no_items = 10;
	for (i=1; i<=no_items; i++)
	{
		this_item = 'selection'+i
		this_index = document.getElementById(this_item).selectedIndex;
		if (this_index) {	// drop down  list
			this_value = document.getElementById(this_item).options[this_index].text;
		} else {		// text box
			this_value = document.getElementById(this_item).value;
		}
		if (this_value == "") {	// uncompleted fields
			this_value = 0;
		}
		if (isNaN(this_value)) {
			alert("Non numeric value entered");
			if (this_index) {	// drop down  list
				document.getElementById(this_item).options[this_index].text = "";
			} else {		// text box
				document.getElementById(this_item).value = "";
			}
			this_value = 0;
			this_price = 0;
		} else {
			this_price = document.getElementById(this_item).getAttribute("price");
		}
		total_price = total_price + parseInt(this_value) * this_price;
	}
	document.getElementById('totalprice').innerHTML = String.fromCharCode(163) +  total_price;
	document.getElementById('package_price_ex_delivery').value =  total_price;
	top.Menu.document.getElementById('package_price_ex_delivery').innerHTML = String.fromCharCode(163) +  total_price;
	top.Menu.document.getElementById('shop_cart').style.visibility = 'visible';
}

function hideCart () {
	top.Menu.document.getElementById('shop_cart').style.visibility = 'hidden';
}