I would like to know how much a certin country spends on its defense
as a whole number (e.g. $4Blillion) to how much as a % (12%). I am
looking for links to sites.

Dear sulafa-ga
The quickest source for this information is the CIA Fact Book.

This page will take you to Military expenditure by each country in US
dollars (alphabetically). The year of the source information varies.
http://www.cia.gov/cia/publications/factbook/fields/2067.html
By rank
http://www.cia.gov/cia/publications/factbook/rankorder/2067rank.html
Notes on this information appears at 
http://www.cia.gov/cia/publications/factbook/docs/notesanddefs.html#2067

Military spending as percentage of GDP (alphabetically).
http://www.cia.gov/cia/publications/factbook/fields/2034.html
By rank
http://www.cia.gov/cia/publications/factbook/rankorder/2034rank.html
Notes on the information
http://www.cia.gov/cia/publications/factbook/docs/notesanddefs.html#2034

For additional information on each country's military, select the
required country from the drop down box and under categories select
the 'Military'.


Stockholm International Peace Research Institute
http://www.sipri.org/
The online military expenditure database provides military expenditure
data by country in the following three formats:
Military expenditure in local currency, at current prices. 1988-2002 
Military expenditure in US dollars, at constant (2000) prices and
exchange  rates, 1988-2002
Military expenditure as a share (%) of gross domestic product (GDP), 1988-2001 

You have to register to use the database
http://projects.sipri.org/milex/mex_database1.html

Use the search option on the front page to search for useful reports
and articles. For instance, this link takes to a report on ?Military
Expenditure and Conflict in Africa? with statistical tables etc.
http://projects.sipri.se/milex/mex_afr_conflict.pdf


Centre for Defence Information 
This has a search database which may provide you with additional
information on certain countries.
http://www.cdi.org/

I hope this answers your question. If it does not, or the answer is
unclear, then please ask for clarification of this research before
rating the answer. I shall respond to the clarification request as
soon as I receive it.
Thank you
answerfinder


Search strategy
Already knew of the CIA web site
"defence spending" "by country"
://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=%22defence+spending%22+%22by+country%22