This bug has been widely reported on the net. See

http://groups.google.com/group/jquery-en/browse_thread/thread/f58c3172a5f52f20

for an example discussion, including a code fix at the very bottom.

The issue, as we understand it, is that when jQuery is accessing a hidden element (CSS display property set to none) in IE, it produces 'NaNpx' as a measurement. For us, it was the lineHeight property on a hidden form select that we were populating using that element's .html method. (Using $.loadJson to construct option elements that we dumped in via .html.)

The error occurs in line 1061 of jquery-1.3.2.js.

if ( set ) {

event[name] = value

The fix is to check for value=='NaNpx' and, if so, change value to a blank string.

if ( set ) {

if (value=='NaNpx'){value = ''}

event[name] = value

For what it's worth, the listserv post I linked above recommended patching the minimized version of jquery-1.3.2 the same way.

search for this

return N.toUpperCase()});if(L){

insert this

if(K=='NaNpx'){K=''}

//before this

J[G]=K}return J[G]}

result:

return N.toUpperCase()});if(L){if(K=='NaNpx'){K=''}J[G]=K}return J[G]}