How to write a Javascript for hiding lookup value id is null in MSCRM 2011

Hi,

Can anyone help me how to write a JavaScript for hiding a lookup value if its value is null.

As per my requirement I have 2 lookup values in one form if it's values are null while opening the record that lookup has to be hide.

For example :In contact Entity I have 2 lookups

one is for USER Lookup and another one is for Account Lookup while opening the record of contact entity and navigating to USER record if the value is null for USER  I need to hide the lookup.

Thanks,

Thanks, Toushu