Dynamic report based on the Table Chosen

Hi All,

I need to create a report which consists of three drop downs out of which, the first drop down being the tables list. Based on the table I choose the other two drop downs should get distinct values from the table respectively. The number of columns displayed for each table in the report varies and the column names are also not same. Can some one guide how this can be done or direct me to the link if this kind of req is already posted somewhere.

thanks,

VSP