How to define a global jQuery function and use (i.e. call it) it all over my Drupal site?

I use JS injector to add JS to my site. I have a particular function which is:

equalheight = function(container){

var currentTallest = 0,
     currentRowStart = 0,
     rowDivs = new Array(),
     $el,
     topPosition = 0;
 $(container).each(function() {

   $el = $(this);
   $($el).height('auto')
   topPostion = $el.position().top;

   if (currentRowStart != topPostion) {
     for (currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) {
       rowDivs[currentDiv].height(currentTallest);
     }
     rowDivs.length = 0; // empty the array
     currentRowStart = topPostion;
     currentTallest = $el.height();
     rowDivs.push($el);
   } else {
     rowDivs.push($el);
     currentTallest = (currentTallest < $el.height()) ? ($el.height()) : (currentTallest);
  }
   for (currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) {
     rowDivs[currentDiv].height(currentTallest);
   }
 });
}

I want to load it on every page in my site and then call it locally at some nodes using CPN module.

The function can be called like this:

$( "div.some-class" ).each(function() {
    var object = $( this ).find("p");
    equalheight(object);
  });

I don't want to re-declare it on each node. I want to define it globally and then access it everywhere.

Any clue how to do that? Thanks.