I have tried to set "Other" value at last of array without using any looping. The array looks like:
array
(
[15] => Business Copywriting & Press Releases
[11] => Business Plans
[20] => Languages
[17] => Legal Writing
[19] => **Other**
[10] => Presentation Design
[13] => Proof reading & Editing
[16] => RESEARCH & SUMMARIES
[12] => RESUMES & COVER LETTERS
[18] => Transcriptions
[14] => Translating
)