How can I make a Loading... screen?

I have a popup window that populates a table with rows from a database and it normally takes about 15 to 20 seconds to load. Does anyone know how I can display a 'Loading... Please Wait.' that will disappear once the data comes up? Thanks in advance for any responses, Mike ****************************************************************** This communication is for informational purposes only. It is not intended as an offer or solicitation for the purchase or sale of any financial instrument or as an official confirmation of any transaction, unless specifically agreed otherwise. All market prices, data and other information are not warranted as to completeness or accuracy and are subject to change without notice. Any comments or statements made herein do not necessarily reflect the views or opinions of Capital Institutional Services, Inc. Capital Institutional Services, Inc. accepts no liability for any errors or omissions arising as a result of transmission. Use of this communication by other than intended recipients is prohibited. ******************************************************************