thanks Nicolas,
sorry its taken me a while to get back to you.
my website is currently on a local server, however i have included a firebug snapshot below:
<div class="hikashop_container">
<div class="hikashop_subcontainer thumbnail">
<div id="img-thumb">
<div id="product-info">
<span class="hikashop_product_name">
<span class="hikashop_product_price_full">
<span class="hikashop_product_code_list">
<form enctype="multipart/form-data" name="hikashop_product_form_6_hikashop_category_information_module_102" method="post" action="/Joomla_3.1.1-Stable-Full_Package/index.php/component/hikashop/product/updatecart">
<div class="hikashop_product_stock">
<input class="btn button hikashop_cart_input_button" type="submit" onclick="var field=document.getElementById('hikashop_product_quantity_field_4');if(hikashopCheckChangeForm('item','hikashop_product_form_6_hikashop_category_information_module_102')){ return hikashopModifyQuantity('6',field,1,'hikashop_product_form_6_hikashop_category_information_module_102','cart',102); } return false;" value="Add to cart" name="add">
<input id="hikashop_product_quantity_field_4" class="hikashop_product_quantity_field" type="hidden" name="quantity" value="1">
</div>
<input id="hikashop_cart_type_6_102" type="hidden" value="cart" name="hikashop_cart_type_6_102">
<input type="hidden" value="6" name="product_id">
<input type="hidden" value="102" name="module_id">
<input type="hidden" value="1" name="add">
<input type="hidden" value="product" name="ctrl">
<input type="hidden" value="updatecart" name="task">
<input type="hidden" value="aHR0cDovL2xvY2FsaG9zdDo4ODg4L0pvb21sYV8zLjEuMS1TdGFibGUtRnVsbF9QYWNrYWdlLw%3D%3D" name="return_url">
</form>
</div>
</div>
</div>
</div>
the bit i want changed to an image is the .btn button hikashop_cart_input_button i believe, not sure though :/
any help would be ace
thanks