function swapImgRestore() { //v3.0
  var i,x,a=document.sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function swapImage() { //v3.0
  var i,j=0,x,a=swapImage.arguments; document.sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=findObj(a[i]))!=null){document.sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}


function preloadimages() { //v3.0
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadimages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}


function enhanceCheckout() {

    var basket = $(".basket").get(0);
    var shippingSelect = $(".shipping select", basket).get(0);
    var shippingPrice = $(".shipping .price", basket).get(0);
    var totalPrice = $(".totalPrice", basket).get(0);

    var parsePrice = function(text) {
        return parseFloat(text.substring(1));
    }

    var updatePriceText = function() {
        var priceText = $("option[selected]", shippingSelect).text().replace(/^.*(£[0-9\.]+).*$/, "$1");
        $(shippingPrice).text(priceText);
    }

    var updateTotalPrice = function() {
        $(totalPrice).text("£" + (parsePrice(totalPrice._originalText) + parsePrice($(shippingPrice).text())).toFixed(2));
    }

    var updateBasket = function() {
        updatePriceText();
        updateTotalPrice();
    }

    // Save the original basket total.
    totalPrice._originalText = $(totalPrice).text();

    // Update the basket now and whenever the option is changed.
    updateBasket();
    $(shippingSelect).change(function() {updateBasket();});
}