I think that is: document.myform[''mymodel[myfield]''].value Thank''s Pedro Valentini I On Apr 5, 2005 12:18 PM, *Pedro Valentini* <pedro-p14LI7ZcAE/pVLaUnt/cCQC/G2K4zDHf@public.gmane.org <mailto:pedro-p14LI7ZcAE/pVLaUnt/cCQC/G2K4zDHf@public.gmane.org>> wrote: Rails use the form field names like: mymodel[myfield] And I want to change one fiel with javascript, how I get/set this form fields? I trayed: document.myform.myform.myfield.value Very close: document.myform.myfield.value = ''foo''; Drew -- Pedro C. Valentini pedro-p14LI7ZcAE/pVLaUnt/cCQC/G2K4zDHf@public.gmane.org +55 (21) 8708-8035