Javascript initialisation function

/**
		* Initialize prettyPhoto.
		*/
		$.prettyPhoto.initialize = function() {

			settings = pp_settings;

			if(settings.theme == 'pp_default') settings.horizontal_padding = 16;

			// Find out if the picture is part of a set
			theRel = $(this).attr(settings.hook);
			galleryRegExp = /\[(?:.*)\]/;
			isSet = (galleryRegExp.exec(theRel)) ? true : false;

			// Put the SRCs, TITLEs, ALTs into an array.
			pp_images = (isSet) ? jQuery.map(matchedObjects, function(n, i){ if($(n).attr(settings.hook).indexOf(theRel) != -1) return $(n).attr('href'); }) : $.makeArray($(this).attr('href'));
			pp_titles = (isSet) ? jQuery.map(matchedObjects, function(n, i){ if($(n).attr(settings.hook).indexOf(theRel) != -1) return ($(n).find('img').attr('alt')) ? $(n).find('img').attr('alt') : ""; }) : $.makeArray($(this).find('img').attr('alt'));
			pp_descriptions = (isSet) ? jQuery.map(matchedObjects, function(n, i){ if($(n).attr(settings.hook).indexOf(theRel) != -1) return ($(n).attr('title')) ? $(n).attr('title') : ""; }) : $.makeArray($(this).attr('title'));

			if(pp_images.length > settings.overlay_gallery_max) settings.overlay_gallery = false;

			set_position = jQuery.inArray($(this).attr('href'), pp_images); // Define where in the array the clicked item is positionned
			rel_index = (isSet) ? set_position : $("a["+settings.hook+"^='"+theRel+"']").index($(this));

			_build_overlay(this); // Build the overlay {this} being the caller

			if(settings.allow_resize)
				$(window).bind('scroll.prettyphoto',function(){ _center_overlay(); });

			$.prettyPhoto.open();

			return false;
		}