Firefox problem with images.readyState

My site includes Javascript code to wipe out all images that did not download (i.e., were not found), so that annoying “missing image” icon does not appear. The code – curtesy of forum members – is simply this:

window.onload = function(){
for(var i=0; i<document.images.length;i++){
if(document.images[i].readyState!=’complete’){
document.images[i].src=’http://blablabla/spacer.gif‘;
}
}

where spacer.gif is a blank image. This works fine under IE, but on Firefox, it causes weird things: First, all images loas fine, then they ALL disappear, and the browser waits for the website forever. Once I remove that code, all works well.

It looks like the readyState property is not supported in Firefox. When I try to alert() it, it says undefined. [Incidentally, if I compare the value of an undefined object to a specific string, shouldn’t the result be false and the code in the if statement above not execute?]

So, how do I do this so it works under Firefox as well?

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