https://www.srremodeling.com/sites/all/modules/nice_menus/js/jquery.bgiframe.js?v=2.1

1/*! Copyright (c) 2013 Brandon Aaron (http://brandon.aaron.sh)
2 * Licensed under the MIT License (LICENSE.txt).
3 *
4 * Version 3.0.1
5 *
6 * Requires jQuery >= 1.2.6
7 */
8
9(function (factory) {
10    if ( typeof define === 'function' && define.amd ) {
11        // AMD. Register as an anonymous module.
12        define(['jquery'], factory);
13    } else if ( typeof exports === 'object' ) {
14        // Node/CommonJS style for Browserify
15        module.exports = factory;
16    } else {
17        // Browser globals
18        factory(jQuery);
19    }
20}(function ($) {
21    $.fn.bgiframe = function(s) {
22        s = $.extend({
23            top         : 'auto', // auto == borderTopWidth
24            left        : 'auto', // auto == borderLeftWidth
25            width       : 'auto', // auto == offsetWidth
26            height      : 'auto', // auto == offsetHeight
27            opacity     : true,
28            src         : 'javascript:false;',
29            conditional : /MSIE 6\.0/.test(navigator.userAgent) // expression or function. return false to prevent iframe insertion
30        }, s);
31
32        // wrap conditional in a function if it isn't already
33        if ( !$.isFunction(s.conditional) ) {
34            var condition = s.conditional;
35            s.conditional = function() { return condition; };
36        }
37
38        var $iframe = $('<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
39                           'style="display:block;position:absolute;z-index:-1;"/>');
40
41        return this.each(function() {
42            var $this = $(this);
43            if ( s.conditional(this) === false ) { return; }
44            var existing = $this.children('iframe.bgiframe');
45            var $el = existing.length === 0 ? $iframe.clone() : existing;
46            $el.css({
47                'top': s.top == 'auto' ?
48                    ((parseInt($this.css('borderTopWidth'),10)||0)*-1)+'px' : prop(s.top),
49                'left': s.left == 'auto' ?
50                    ((parseInt($this.css('borderLeftWidth'),10)||0)*-1)+'px' : prop(s.left),
51                'width': s.width == 'auto' ? (this.offsetWidth + 'px') : prop(s.width),
52                'height': s.height == 'auto' ? (this.offsetHeight + 'px') : prop(s.height),
53                'opacity': s.opacity === true ? 0 : undefined
54            });
55
56            if ( existing.length === 0 ) {
57                $this.prepend($el);
58            }
59        });
60    };
61
62    // old alias
63    $.fn.bgIframe = $.fn.bgiframe;
64
65    function prop(n) {
66        return n && n.constructor === Number ? n + 'px' : n;
67    }
68
69}));