How do you select more than one element by id?

I have two identical click events for two different elements that do not share a class, as such: ``` $("#element_1").click(function(){ alert("hello world"); }); $("#element_2").click(function(){ alert("hello world"); }); ``` I am looking for a way to assign that same click function to both of them without externalizing the function or repeating it (as seen above). If the elements shared the same class, I would have done something like this: ``` $(".element_class").click(function(){ alert("hello world"); }); ``` but they do not. How do I achieve something like that in jQuery 1.3? Thank you!