drawing arrow

Hi people,

i want to put arrow from the middle of div 1 to middle of div 2 like is in this picture http://qkpic.com/9f0e6
I am using jquery dragabble and dropabble script and library. Divs are putted d&d method to the right side of web page from " menu " divs on the left side.
It (arrow) can be picture or something like this.

can someone help me ? thank you