Accessing Parent form information in a child form in CRM 3.0

In one fo my recent projects i needed to access parent from field to check a certain value in an child form. I Knew this is possible using client side java script and did a search in the web to find any help. I found a prefect link which states about this. It's from stunnware. You also can use this link when you want to access parent form. the link is given below.

http://www.stunnware.com/crm2/topic.aspx?id=JS6

also for more javascript functions with CRM check the above link..