Displaying an ALV report using a saved layout.

Dear friends

In ALV report there are 2 standard buttons.

One says "select Layout CTRLF9" and another one says "Save Layout CTRLF10".

Using this I can select the layout and save it using some variable.

Now I want to create a field in the main screen so that when

I enter this saved name and run the ALV report, it should show

report using the layout I entered selected (which was saved earlier).

Where will this variable get saved and how can i access this and make it

display using this layout.

Any feed back will be greatly appreciated.

Thanks

Ram