three instances of a4j seem to be causing a javascript error

[jlong_venarc]

three instances of a4j seem to be causing a javascript error in IE6 / 7 / 8

I'm running a Seam application using RichFaces. The page itself is pretty tame, and its producing an error in IE6/7/8. the error is very strange:

Message: Expected ')'
Line: 1
Char: 189
Code: 0
URI: http://blach/blah//blah.html?cid=1023

the javascript it's pointing to is generated by a4j:jsFunction. there are only 3 instances, which i reproduce here

<a4j:jsFunction name="reRenderFiles"
 reRender="filesList,newFilesList,#{reRenderOnSelect}"
 ajaxSingle="true" eventsQueue="queue" />

 <a4j:jsFunction name="handleUploadCompletion" rendered="#{selectable}"
 reRender="filesList,newFilesList,#{reRenderOnSelect}"
 ajaxSingle="true" eventsQueue="queue"
 oncomplete="handleUploadComplete()" />

 <a4j:jsFunction name="handleUploadCompletion" rendered="#{not selectable}"
 reRender="filesList,newFilesList"
 ajaxSingle="true" eventsQueue="queue"
 oncomplete="unlockScreen()" />

the only way to get the error to go away (and in so doing break the functionality) is to remove one of the a4j:jsFunction components.

for example, if I remove:

<a4j:jsFunction name="reRenderFiles"
reRender="filesList,newFilesList,#{reRenderOnSelect}"
ajaxSingle="true" eventsQueue="queue" />

it works, though it doesnt seem to matter which I remove, so long as I do. I wondered if this strangeness might be due to cached versions of my class files in Eclipse or tomcat, but nothing seem to fix it except removing a a4j:jsFunction component.

Any ideas? Any way of controlling the output of the JS so that it produces super clean, non IE-offensive code? Naturally, it works perfectly in Safari/Chrome/Firefox.

Im a little stuck and any input on what stone to turn would be appreciated.

Thanks,
Josh