xsl stylesheet does not always process javascript

I have a .xsl sheet that serves as both a data entry and edit form. When this sheet is called using a -new submit (the record must be created first in the FM database so various fields in the .xsl sheet can be automatically populated), a user can enter data into the entry fields, click submit, and the javascript validation works great. When this same .xsl sheet is called using a -find submit (so the previously entered information can be edited), the user can modify the data, but the javascript is never run yet the record in FM is modified according to the edits made. I need to have the javascript run every time. Any ideas on what is going on?