JQuery :: Mouseenter - DIV Slider Automatically Move Left

I want to do like that, I have a center point, when I hover mouse to left of that point, slider will move left and same with right
var margin = $("#viewer").offset().left;
padding = $("#viewer").width()/2,
m = margin+padding;
$("#viewer").mouseenter(function(e) {
var te = m-e.pageX;
$('#slide').animate({left:"-="+te+"px"}) ;
});

And
<div id="viewer">
<div id="slide">
<img id="image1" class="current" src="21.jpg" alt="Amstrad CPC 472">
<img id="image2" src="45ew645f4sa.jpg" alt="Atari TT030">
<img id="image3" src="4h54df54hg5a.jpg" alt="Commodore 64">
<img id="image4" src="46eg.jpg" alt="Commodore 128">
<img id="image5" src="4w54erwe.jpg" alt="Sinclair ZX Spectrum +2">
</div></div>
But, it only move left / right one time. So, how can div slider automatic move left (while mouse still hover viewer) forever until my mouse out of viewer.