Jquery UI: range slider. Which slider are moved?

Question

At this demo page: http://jqueryui.com/demos/slider/#event-change

The event 'slide' rewrite has two inputs at once:

$( "#amount" ).val( "$" + $( "#slider-range" ).slider( "values", 0 ) +
            " - $" + $( "#slider-range" ).slider( "values", 1 ) );

For my purposes I want to know, which of two sliders are moved (min or max). How I can get it?