How can i send an image map area id to a php file

Question

This is my image map:

<map name="frozen">
        <area coords="88,172,6,130" shape="rect" id="1001"> 
        <area coords="61,247,143,291" shape="rect" id="1002">
        <area coords="196,132,278,172" shape="rect" id="1003">
        <area coords="237,289,155,249" shape="rect" id="1004">
        <area coords="336,288,253,248" shape="rect" id="1005">
        <area coords="349,248,430,289" shape="rect" id="1006">
    </map>

This is the image map that displays categories for different types of food that are stored in a MySQL database. Each node at the bottom of a category is an area on an imagemap, when I click on this area I want it to send the associated product id of that product to a PHP file called show_products.php which will display the details of that product. How can I get these unique product IDs sent to another PHP file where a user clicks on the associated area and the show_products.php page will display all the details of the selected product?