how to use lo_import function

hai,
My system IP Address is 172.16.9.73
I am accessing database from server..i.e172.16.5.179
Now,i want use lo_import and lo_export functions storing and retriving
bitmap images...

while executing this query...

In local database:
----------------------
update imprest_holder set specimen_signature=lo_import('c:/sign.bmp')
Query returned successfully: 3 rows affected, 31 ms execution time.

When uploading data into server database:
-----------------------------------------------------------
update imprest_holder set specimen_signature=lo_import('c:/sign.bmp')

ERROR: could not open server file "c:/sign.bmp": No such file or
directory

Now what can i do?
Please help any one...

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