In some situations, you would like to be able to cancel an operation you have started with a button. For example, you may have a script that copies information from one record to another. When users incorrectly click any button tied to a script that performs automated actions, you run the risk of invalid information being in your database. 

Use the confirm method to ask the user to make a decision that requires either an OK or a Cancel. The message argument specifies a message that prompts the user for the decision. The confirm method returns true if the user chooses OK and false if the user chooses Cancel.