Performing Drag and Drop in Selenium IDE, should be pretty simple having selenium IDE is record mode do the drag and drop operation you will see the coordinates will be captured by IDE and then you can use the same in RC and webDriver implementation with their API;s
How to handle non toggle checkbox?
How to perform drag and drop activity for a button / element in IDE and RC?
Performing Drag and Drop in Selenium IDE, should be pretty simple having selenium IDE is record mode do the drag and drop operation you will see the coordinates will be captured by IDE and then you can use the same in RC and webDriver implementation with their API;s