How to encode URL parameters in pl/sql?

How to encode url and its paramters in PL/SQL to call a page using html GET method? Is there any equiavlent method of java's URLEncoder.encode() method in pl/sql (in any web packages) ?
Any help/pointers highly appreciated.
P.S. : URGENT PLEASE!!!

http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:371959198986

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