Javascript Cart Button

Hey,

I am a photographer, I have a website with a gallery. The gallery is ran by Javascript, when you click the thumb nail the script will take the t off the same so say it was 001t.jpg it will make it 001.jpg and put that file in the div tag called image

However I want to be able to sell them using paypal's shopping cart...
however I need to put the gallery name and image name in the name on the button but I cant code javascript so can someone code me one that will update this for me and then put the code it makes into a div tag called cart?

PLEASE HELP!!!

Here is the paypal code

Code:

---

<form target="paypal" action="https://www.paypal.com/cgi-bin/webscr"
method="post">
<!-- Identify your business so that you can collect the payments. -->
<input type="hidden" name="business" value="EMAIL">
<!-- Specify an Add to Cart button. -->
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="add" value="1">
<!-- Specify details about the item that buyers will purchase. -->
<input type="hidden" name="item_name" value="Gallery - '.$gal.' / Photo - 002">
<input type="hidden" name="currency_code" value="GBP">
<!-- Provide a dropdown menu option field. -->
<input type="hidden" name="on0" value="Color">Color<br />
<select name="os0">
<option value="Select a color scheme">
-- Select a color --</option>
<option value="Colour">Colour</option>
<option value="B+W">Black and White</option>
</select> <br />
<!-- Provide a dropdown menu option field with prices. -->
<input type="hidden" name="on1" value="Size">Size <br />
<select name="os1">
<option
value="Select a size">-- Select a size --</option>
<option value="2x4">2 x 4 - &pound;3.95</option>
<option value="3x5">3 x 5 - &pound;4.95</option>
<option value="4x6">4 x 6 - &pound;5.95</option>
</select> <br />
<!-- Specify the price that PayPal uses for each option. -->
<input type="hidden" name="option_index" value="1">
<input type="hidden" name="option_select0" value="2x4">
<input type="hidden" name="option_amount0" value="3.95">
<input type="hidden" name="option_select1" value="3x5">
<input type="hidden" name="option_amount1" value="4.95">
<input type="hidden" name="option_select2" value="4x6">
<input type="hidden" name="option_amount2" value="5.95">

<input type="hidden" name="shopping_url" value="http://www.roizer.com">
<input type="hidden" name="shipping" value="1.00">
<input type="hidden" name="shipping2" value="0.50">
<!-- Display the payment button. -->
<input type="image" name="submit" border="0" src="https://www.paypal.com/en_US/i/btn/btn_cart_LG.gif" alt="PayPal - The safer, easier way to pay online">
<img alt="" border="0" width="1" height="1" src="https://www.paypal.com/en_US/i/scr/pixel.gif" >
</form>

---

Dan

set it up via paypal... dont code your own cos its very unsecure ect... just us paypals website to do it..