Relative Positioning of External Graphics

Hi All,

i want to move graphic down if the text in the block increases, i have tried
relative positioning but can't come up with the exact solution

the example below shows what i am trying to achieve

here image is right after the text  ends
---------------------
Text
Text
Text
------------
Image
------------

---------------------

Now if the text increases the image should move down

---------------------
Text
Text
Text
Text
Text
------------
Image
------------

---------------------

Thanks in advance,

-- 
Regards,
Bilal Ilyas