How to Check Readonly Filed values in MS CRM Form using Javascript

Hi All,

I  googled it  for getting Read-only values from MS CRM Form,I am unable to find the Same,

Can any help me out how to differentiate Between read-only  or Non-Read-only  fields   ,we have any option like getting read-only values from MS CRM Form Not .

Thanks & Regards,

Sairam Pamidi