crm button by using javascript

hi i have tried this solution below it works perfect but buttontext shows empty.

http://social.microsoft.com/Forums/en-US/crmdevelopment/thread/75758803-521f-4730-ab74-cd02cbb56842

ConvertToButton('new_fieldname', 'ButtonText','100px',FunctionName,'Button Label');

crmForm.all[fieldname].DataValue = buttontext;

is there any solution about that?

Crm Software Specialist