I need to get the 2 values identifiers for using it in the php code I have. Could not understand what are the identifiers. 

please let me know what are they ? here's my code: 

2. <script>
3.   $(function() {
4.     $( "#range-div" ).slider({
5.       range: true,
6.       min: 16,
7.       max: 120,
8.       values: [ 16, 45 ],
9.       slide: function( event, ui ) {
10.         $( "#amount" ).val( ui.values[ 0 ] + " - " + ui.values[ 1 ] );
11.       }
12.     });
13.     $( "#amount" ).val($( "#range-div" ).slider( "values", 0 ) +
14.       " - " + $( "#range-div" ).slider( "values", 1 ) );
15.   });
16.   </script>