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offset() is null


laucinieks

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   <script type="text/javascript">
$.fn.stickyfloat = function(options, lockBottom) {
var $obj             	= this;
var parentPaddingTop 	= parseInt($obj.parent().css('padding-top'));
var startOffset     	= $obj.parent().offset().top;
var opts             	= $.extend({ startOffset: startOffset, offsetY: parentPaddingTop, duration: 200, lockBottom:true }, options);

$obj.css({ position: 'absolute' });

if(opts.lockBottom){
var bottomPos = $obj.parent().height() - $obj.height() + parentPaddingTop; //get the maximum scrollTop value
if( bottomPos < 0 )
bottomPos = 0;
}

$(window).scroll(function () {
$obj.stop();

var pastStartOffset        	= $(document).scrollTop() > opts.startOffset;
var objFartherThanTopPos	= $obj.offset().top > startOffset;
var objBiggerThanWindow 	= $obj.outerHeight() < $(window).height();

if( (pastStartOffset || objFartherThanTopPos) && objBiggerThanWindow ){
var newpos = ($(document).scrollTop() -startOffset + opts.offsetY );
if ( newpos > bottomPos )
newpos = bottomPos;
if ( $(document).scrollTop() < opts.startOffset )
newpos = parentPaddingTop;

$obj.animate({ top: newpos }, opts.duration );
}
});
};

$('#menu').stickyfloat({ duration: 400 });
</script>

 

Vēlos ielikt lapā menu slide kodu, bet visu saliekot (pievienojot jquery bibliotēku un uzliekto menu id="menu", ieejot lapā parādās - $obj.parent().offset() is null (no firebug consoles). Kā izlabot?

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