Draggable iframe problem!

Hello,
I' m trying to build an MDI application with HTA and i'm facing the following problem. In order to create the draggable forms contained in the MDI, i' ve created DIVs each one of which contains a table with two cells. The upper cell represents the titlebar of the form while the other cell represents the body of the form. The javascript code that makes the DIV draggable works fine (the DIVs can be dragged only from the titlebar) until i place an iframe inside the body cell. Without the iframe, the cursor does not move out of the titlebar while dragging. The problem is that if i place a iframe in the body, the cursor moves out of the titlebar while dragging and that obstructs the down movement because the cursor gets in the body cell (where the iframe is located) and the dragging stops.
Any ideas why this happens and how i can prevent it?
Thanx.