Updating shopping cart array

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Hi Folks
I have the following code to change the quantity in an array that list all the items selected in a shopping cart and displayed on an 'ordercontent' page.
If i only have one item on the page the code i am using updates the quantity no problem. BUT as soon as i add a second or third item things go wrong. What i need to do is pass the array record id to the update code.
The code for the text area named 'quantity' and my submit!!! button is as follows:
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<input name="quantity" type="text" class="smalllight" value="#session.app_shoppingcart.quantity#" size="1"></td>
<td width="5%"><input name="btn_change" type="submit" class="smalllight" value="+ -"></td>
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and the code that actually changes the quantity is as follows:
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<!---Change quantity--->
<cfif IsDefined("btn_change")>
<cfset newitem = 0>
<cfloop from="1" to="#arrayLen(session.app_shoppingcart)#" index="i">
<!----<cfif session.app_shoppingcart.recordid EQ #form.recordid#>---->
<cfset session.app_shoppingcart.quantity = #form.quantity#>
<cfset newitem = 1>
</cfloop>
</cfif>
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I have the line that looks for the record ID commented out at the moment to stop errors.
But all i want to do is pass the record id to the code, can someone please help with this
cheers and thanks in advance
Grabit

What error message are you getting?

Also, you don't need to hash most of that stuff out, especially in the comparisons and the <cfset>'s.

Is session.app_shoppingcart an array?

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Yep the cart contents are held in an array, when i only have one item in the cart i dont get any problems because there is only 1 record to update so it does it. If there are more than 1 item in the cart i get a recordid not found error so what i need is a way to add a record id to the "+ -" button beside each quantity so that can pass the correct record id with it to the processing script.
cheers

Shouldn't you use your index i to adress a field in your array or alternativly loop through the arrayitems directly instead of only looping the value of its length?