How do I utilise GetBySelector on checkboxes?

I'm trying to do utilise a shopping cart using javascript and xml.

First, I am printing a catalog of items from my xml database onto the page. For each record, I am printing the name of the item, the price and a checkbox. The checkbox is ofcourse <input type='checkbox' id=''/> The id value is the corresponding id number of the item.

What I would like is that the user selects an item on the catalog, by clicking the checkbox next to the name & price and then clicking an Add to cart button.

Clicking the Add to Cart button should call the add() javascript function. What I would like is that for all the checkboxes selected from the catalog, each item is added to the shopping cart.

How do I accomplish this using getElementBySelector??
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Michel PlungjanIT ExpertCommented:
Well you first need to include this script

since getElementBySelector is not a dom javascript call.

I would use getElementsByTagName or forms access and a simple loop (assuming here that each relevan checkbox is named something starting with catalogItem...):
function add(theForm) {
  var total = 0;
  for (var i=0;i<theForm.elements.length;i++) {
    var item = theForm.elements[i];
    total+=(item.type=='checkbox' &&'catalogItem')==0 && item.checked)?0:item.value

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