สอบถามการทำแบบนี้อะครับไม่รู้เรียกว่าอะไร(มีตัวอย่าง)

var feed_width = $('#feedback').width();
var scr_w = screen.width; // Screen Width
var btn_width = 60;
var move_left = -(feed_width - btn_width);
var slide_from_left = 0;
var first=0;


positioningForm();

$('.left_btn').click(function(){
    if (first ==0){
        slideFromleft();
        first=1;
    }else{
        var pos = $('#feedback').position();
        if (pos!=null)
        {
            var ls = pos.left;
            moveLeft();
            first=0;
        }
    }
});
$('.feed_close').click(function(){
    var pos =$('#feedback').position();
    if (pos!=null)
    {
        var ls = pos.left;
        moveLeft();
    }

});


function closeAS(){
    var pos = $('#feedback').position();
    if (pos!=null)
    {
        var ls = pos.left;
        moveLeft();
    }
}

function positioningForm(){				

    $('#feedback').animate({
        left: "-"+(feed_width - btn_width)+"px"
    },{
        duration:5000,
        easing: 'easeOutExpo'
    });

}           
function slideFromleft(){

    $('#feedback').animate({
        left: slide_from_left+"px"
        },{
        duration: 'slow',
        easing: 'easeOutExpo'
    });

}
function moveLeft(){
    $('#feedback').animate({
        left: move_left+"px"
        },{
        duration: 'slow',
        easing: 'easeOutExpo'
    });
    $('.left_btn').show();
}