way 1.js

var Favorite = {
	client_name: "",
	client_id: "",
	user_id: "",
	add_or_remove: "",
	
	getID: function(params){
		this.client_name = params.attr("client_name");
		this.client_id = params.attr("client_id");
		this.user_id = params.attr("user_id");
		this.add_or_remove = params.attr("add_or_remove");
	},
	
	post_action: function(params){
		this.getID(params);
		var fav = this;
		$.post('/users/'+this.user_id+'/'+this.add_or_remove+'_favorites.js', 
				{
					id: this.user_id, 
					authenticity_token: token, 
					client_id: this.client_id
				}, 
			function(data) {
			 fav.update_page.apply(fav) 
			});
	},
	
	update_page: function(){
		$("#flash").text("Favorite Added");
		$("#flash").slideDown();
		$("#items").prepend("<li class='client' id="+this.client_id+">&nbsp;&nbsp;&nbsp;"+this.client_name+"</li>");
		$("#"+this.client_id).show();
	}
};

way 2.js

$.extend({
  shove: function(fn, object) {
    return function() {
      return fn.apply(object, arguments);
    }
  }
});

var Favorite = {
	client_name: "",
	client_id: "",
	user_id: "",
	add_or_remove: "",
	
	getID: function(params){
		this.client_name = params.attr("client_name");
		this.client_id = params.attr("client_id");
		this.user_id = params.attr("user_id");
		this.add_or_remove = params.attr("add_or_remove");
	},
	
	post_action: function(params){
		this.getID(params);
		$.post('/users/'+this.user_id+'/'+this.add_or_remove+'_favorites.js', 
				{
					id: this.user_id, 
					authenticity_token: token, 
					client_id: this.client_id
				}, 
			$.shove(this.update_page, this));
	},
	
	update_page: function(){
		$("#flash").text("Favorite Added");
		$("#flash").slideDown();
		$("#items").prepend("<li class='client' id="+this.client_id+">&nbsp;&nbsp;&nbsp;"+this.client_name+"</li>");
		$("#"+this.client_id).show();
	}
};