How to draw a rectangle on a web page?

Hi,

How do I draw a rectangle onto an Imagebox control on an asp.net webpage when the user drags the mouse within the imagebox control?

Inserting another imagebox onto the original imagebox when the user drags the mouse is ok too

http://www.asarconsultants.com/graphics2.htm
http://www.asarconsultants.com/graphics.htm