best way to handle several body onload

[eluser]zenon[/eluser]
Hi, I'm using jquery routine to init all elements where body document is laoded.

Code:

$(document).ready(function(){

});

How could I handle this routine for each page?

One solution may be to build a first common header part and another specified on each controller, but another solution I heard could be to inject a javascript source still from controller.
Have you ever hear about this?
However, which approach do you use?

Thank you