(function(){

    // shorthand
    var SB = Shadowbox;
    var SL = SB.lib;
    var C = SB.getClient();

    /**
     * Constructor. This class is used to display web pages in an HTML iframe.
     *
     * @param   {String}    id      The id to use for this content
     * @param   {Object}    obj     The content object
     * @public
     */
    Shadowbox.iframe = function(id, obj){
        this.id = id;
        this.obj = obj;

        // height defaults to full viewport height
        this.height = this.obj.height ? parseInt(this.obj.height, 10) : SL.getViewportHeight();

        // width defaults to full viewport width
        this.width = this.obj.width ? parseInt(this.obj.width, 10) : SL.getViewportWidth();
    };

    Shadowbox.iframe.prototype = {

        /**
         * Returns an object containing the markup for this content, suitable
         * to pass to Shadowbox.lib.createHTML().
         *
         * @param   {Object}    dims    The current Shadowbox dimensions
         * @return  {Object}            The markup for this content item
         * @public
         */
        markup: function(dims){
            var markup = {
                tag:            'iframe',
                id:             this.id,
                name:           this.id,
                height:         '100%',
                width:          '100%',
                frameborder:    '0',
                marginwidth:    '0',
                marginheight:   '0',
                scrolling:      'auto'
            };

            if(C.isIE){
                // prevent brief whiteout while loading iframe source
                markup.allowtransparency = 'true';

                if(!C.isIE7){
                    // prevent "secure content" warning for https on IE6
                    // see http://www.zachleat.com/web/2007/04/24/adventures-in-i-frame-shims-or-how-i-learned-to-love-the-bomb/
                    markup.src = 'javascript:false;document.write("");';
                }
            }

            return markup;
        },

        /**
         * An optional callback function to process after this content has been
         * loaded.
         *
         * @return  void
         * @public
         */
        onLoad: function(){
            var win = (C.isIE) ? SL.get(this.id).contentWindow : window.frames[this.id];
            win.location = this.obj.content; // set the iframe's location
        },

        /**
         * Removes this iframe from the document.
         *
         * @return  void
         * @public
         */
        remove: function(){
            var el = SL.get(this.id);
            if(el){
                SL.remove(el);
                if(C.isGecko) delete window.frames[this.id]; // needed for Firefox
            }
        }

    };

})();