Sql Server Database Comparison Tool

Hi, I'm looking for a tool to compare 2 sql server database and makes a script of the differences (like an added table or record). We want to use it to generate a script which we can send to our customers to update their database if a change has been made. Example: We send our customers database A. After half a a year they request some changes to be made to the application that affects the database, say a table has to be added. We want the tool to automatically detect the difference between database A when it was first released and after the changes has been made and generate a script. Anyone suggestions? T.I.A., ratjetoes.