[jQuery] When using blogUI and setTimeout in firefox , a strange behavior

[CrazyLion]

Hi all:

 When i using blogUI in firefox(ie 6.x and ie7.0 are ok), there is a
strange behavior.

To avoid the call-stack issue in ie 7.0 , i cant' just write:

$().ajaxStart($.blockUI).ajaxStop($.unblockUI);

I must write :

$().ajaxStart(function(){
  setTimeout($.blockUI,0);
});

but...    the default message(should be "please wait" ) will become
some integer(maybe 36...).

It looks like:
http://crazylion.files.wordpress.com/2007/11/1.png

otherwise, if i write:

$().ajaxStart(function(){
setTimeout(function(){$.blockUI();},0);
});

it can work correctly now . like 
http://crazylion.files.wordpress.com/2007/11/2.png

i have no idea about this.   Does setTimeout  do something i dont
know?

Thanks a lot :)

--CrazyLion