function showCaptcha(doNext) {document.getElementById("overlay").style.visibility=(document.getElementById("overlay").style.visibility=="visible")?"hidden":"visible";doNext;}

function updatePrice(current_price,price_inc)
{
	var tmpOldVal=parseFloat(current_price);
	if (!document.getElementById("insure").checked){var tmpNewVal=parseFloat(tmpOldVal);}else{var tmpNewVal=parseFloat(tmpOldVal+price_inc);}
	document.getElementById("total_cost").innerHTML="£"+FormatCurrency(tmpNewVal)+".";
}
function FormatCurrency(amount){var i = parseFloat(amount);if(isNaN(i)) { i = 0.00; }var minus = '';if(i < 0) { minus = '-'; }i = Math.abs(i);i = parseInt((i + .005) * 100);i = i / 100;s = new String(i);if(s.indexOf('.') < 0) { s += '.00'; }if(s.indexOf('.') == (s.length - 2)) { s += '0'; }s = minus + s;return s;}