vote system

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I have a big list where people can vote for each item. Every item has a unique ID. There's a button next to every item, and if they're pressed, 1 should be added to the total vote count.
My question is, how do I forward that unique id so the script knows where to add the vote

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<?php
$id = $_POST['$id'];
//echo "$id" or die("donno number");
$connection = mysql_connect("localhost", "root") or die ("Unable to Connect to database");
mysql_select_db("netRadio") or die ("Unable ro select database");
$add = ("SELECT max(votes) FROM netRadio");
$sqladd = ("INSERT INTO list (votes) WHERE id LIKE '%".$id."%' VALUES('$add')");
mysql_query($sqladd) or die (mysql_error());

mysql_close($connection)
?>

in the file where it's submitted I have a line in the form like this:

<input type='hidden' name='$id'> 

where $id is the unique id of the item.