IE/javascript div resizing/incorrect image loading

Using Fiddler I've realised that a script I have that merely resizes a div
will cause images to be called multiple times if they're inside that div.

For instance, suppose I have 6 LIs in the div, each with a background image
of a bullet point:

1) without the script, the bullet point correctly only gets requested once.
2) with the script, the bullet point is requested 7 times by the browser (so
once initially, then once for each LI after the resize).


Here is the script:
-------------------------------------------------------

function $(e){return document.getElementById(e);}

function init()
{
	var c1=$('left').offsetHeight,
	    c2=$('content').offsetHeight,
	    c3=$('right').offsetHeight;

	var cmax=Math.max(c1,c2,c3);

	var d1=cmax-c1,
	    d2=cmax-c2,
	    d3=cmax-c3;

	if (d1 > -4) $('left').style.height = $('left').offsetHeight + d1 + 4 +
"px";
	if (d2 >  0) $('content').style.height = $('content').offsetHeight + d2 +
"px";
	if (d3 > -4) $('right').style.height = $('right').offsetHeight + d3 + 4 +
"px";

}

if (window.attachEvent)
	window.attachEvent('onload',init);
else
	window.addEventListener('load',init,false);


Doesn't appear to be a problem in firefox, opera etc.  Is this an
unavoidable, or an oddity that can be worked around?

Is it also linked to my other problem?  (Will send that email in 2 minutes)



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