[jQuery] How do you handle 2 differents and 1 action?

[Thierry]

I have the following piece of code which checks if a user has pressed
the Enter key in a text input with id="text_input" and then performs
some action:

$(document).ready(function()
{
   $("#text_input").keyup(function(e)
   {
      // Checks if the Enter key was entered
      if(e.keyCode == 13)
      {
         // perform the action
      }
   });
});

I also have a button with id="push_button" that I wish will perform
the same action as above when clicked.  How can I rewrite the above so
that I check for either of those two events and perform that one
action without code duplication?