JavaScript error in compiling JavaScript

I used a tip to let a user hit Enter after input test in a field to launch code in a button, in stead of hitting the button (which is also possible, of course).

This was the is:

http://www-10.lotus.com/ldd/nd6forum.nsf/55c38d716d632d9b8525689b005ba1c0/c7ce0bad6b6ec83385257180007d6761?OpenDocument

When I let the form open in the Notes clies, after some time I get a javascript error:

This is explained is an IBM’s Technote: LO47987: ERROR COMPILING JAVASCRIPT

Has anybody also this error and found a solution?

Thanks in advance,

Koos van Harmelen