could you store the ID in script and pass down in a querystring using the anchor click event?
Something similar to the following maybe..
$('anc_id').click( function() {
//code to move to step 2...
//something like....
var step2 = 'step2-php?id=' + _ID_ ;
....
return false;
});
note: you need to modify the function above to suit your needs.
regards