i have created four dynamic points on a graph and joint them to each other, which make a rectangular shape , that is not exactly rectangle.

i need to fill this shape with color.
and with some opacity effect would be better to make the filled color bit transparent...

waiting for you people to help me to let me overcome through this problem .. please help me
THANK YOU,

ok i m going to be more descriptive to my question.

see i have attached the graph where there is two boxes like a rectangular shape but not exactly rectangular because it is created by joining 4 lines to each other.. just take a look

now i want to fill color in the red box with opacity that to show graph background as well. i m not able to fill that red rectangular box.
kindly help me.

any question on confusion , your welcome

THANK YOU

//Graph Image Output----------


<img src="http://upload5.postimage.org/1910/graph.jpg" border=0>