Jquery Slide

Jquery Slide

Hello everboy, my name is Taniguchi and I'm new at jquery and I'm having trouble with the following piece of code.
$('#day_slider').slider 
        (
        {
        range: "max",
        min: min_value,
        max: max_value,
        value: 1,
        step: 1,
        slide: function (event, ui) {
            if (ui.value == 1) {
                $("#slider_value").html('Follow Up in ' + ui.value + ' Day');
            }
            else {
                $("#slider_value").html('Follow Up in ' + ui.value + ' Days');
            }
        }
    });
    $("#slider_value").html('Follow Up in ' + $("#day_slider").slider("value") + ' Day');
});

I dont know what this  lines of  code means:
 $('#day_slider').slider
slide: function (event, ui)
 $("#slider_value").html