var updateEstimate = function()
{
    var element = $('selectDesign');
    var text = element.options[element.selectedIndex].text;
    var position = text.search(/[0-9]+\.[0-9]+/);
    var price = text.substr(position);

    $$('#content .subtotal ins')[0].innerHTML = price;
    $$('#content .total ins')[0].innerHTML = price;
}

window.addEvent('domready', function() {
    updateEstimate();
    $('selectDesign').addEvent('change', updateEstimate);
});