// This is why we moved from prototype to jQuery

FastInit.addOnLoad(function()
{
	$$('#body_content_left_content', '#body_content_right_content').each(function(content){
		// it's okay if the first and last descendant are the same
		descendants = content.descendants().select(function(d){return d.tagName == "P"})
		if ((first_descendant = descendants.first()) != null) { first_descendant.addClassName('first_paragraph'); }
		if ((last_descendant = descendants.last()) != null) { last_descendant.addClassName('last_paragraph'); }
	});
});

//becomes:

$(document).ready(function(){
  $('#body_content_left_content p:first, #body_content_right_content p:first').addClass('first_paragraph');
});