I think a good starting place might be to map out the process, and then decide which jQuery tools you will need to use for each user action.

so the user process might be:

• Click on your content div on a draggable area


• Drag the content, which will keep the content inside that div


• release the mouse, which will put the content into a droppable container, which will adjust the size of the previous content to fit the droppable size

which needs the following types of event listeners:

• mouseup


• mousedown


• animate

At the very least. Another option might be to check out the jQuery UI source, and see how they do it! Which will tell you exactly what to do but you can add to it or trim where necessary.