How to solve the margin problem using LaTeX

If you have ever compile a paper using LaTeX, especially for IEEE and ACM. You must have found the the margin to the bottom of the A4 paper is larger than those published papers found in ieeexplore or ACM portal. You may use the following commands to prevent it.

\oddsidemargin -0.25in
\evensidemargin -0.25in
\textwidth 6.75in
\topmargin -0.75in
\textheight =10.0in

This piece of code was tested on ACM and IEEE latex package for Proceedings and Journal.

Thanks to Satish Prabu for such a huge help :-)