Floating environments in latex

http://en.wikibooks.org/wiki/LaTeX/Floats,_Figures_and_Captions

\usepackage{float}

the following options could be used
for figure, table environments

h Place the float here, i.e., approximately at the same point it occurs in the source text (however, not exactly at the spot)
t Position at the top of the page.
b Position at the bottom of the page.
p Put on a special page for floats only.
! Override internal parameters Latex uses for determining "good" float positions.
H Places the float at precisely the location in the LaTeX code. Requires the float package,[1] e.g., \usepackage{float}. This is somewhat equivalent to h!.