mysterious trouble with jQuery .animate() with step option -

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not long ago have deal easy work: animate 2 elements together, moving second 1 according first element moving. not problem: .animate() step option makes well, , made work. troubles began when attempted inject code test-page real site. clarified main part of .animate() executed, function pointed step option not executed. reason of linking document script called interface.js (http://interface.eyecon.ro) it's used creating elements, fish-eye panel in case. link (script type="text/javascript" src="..." etc) script "kills" animation (second part of it, step function), without calling its(interface.js) functions. illustrate trouble i've prepared little example: 2 red boxes positioned in opposite corners of rectangle, clicking on them starts animation, swapping places.

html:

<div id="container">     <div id="div1" class="box"></div>     <div id="div2" class="box"></div> </div>

css: (sorry ugly selectorless "css"-syntax, that's first post, css correct in real file)

container-id-selector {     width: 500px; height: 100px; position: relative; } div1-id-selector {     background-color: red; width: 50px; height: 50px;     position: absolute;     left: 0px; } div2-id-selector {     background-color: red; width: 50px;     height: 50px; position: absolute;     top: 50px; right: 0px; } box-class-selector {     cursor: pointer; }

javascript:

$(document).ready(function() {         $(".box").click(function(){             $("#div1").animate({ left: 450}, {         duration: 2000,         step: function(now, fx){             $("#div2").css("left", 450 - now);             }         });         });      });

this example works perfectly, if add 1 line :

<script type="text/javascript" src="interface.js"></script>

kills animation:( first box moving left right, second not moving @ all, because function pointed step not calling. including file (interface.js), not calling functions. know reason of such problem? want know internal causes of such strange behavior, , ways work-around it. ideas?:) lot!

p.s. there non-minimized version of script on developer's site, js&jquery skills poor detail investigation. lot again, , sorry many letters, i'm confused trouble:(


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