css background image is not show change default picture

1$("html").css({ "background-image": "url('../images/pattern%20copy.png'), url('../images/visuals/visual3-edit.jpg')", "background-position": "center", "background-repeat": "no-repeat", "background-attachment": "fixed"  });

1var imageURLs = $('div');
2imageURLs.each(function(index, element){
3    var imageURL = $(element).css('background-image').replace('url("', '').replace('")', '');
4    if (imageURL != "none"){
5        $.ajax({
6           url: imageURL,
7           type: 'HEAD',
8           error: function(){
9              //error handling for broken image url
10           }
11        });
12    }
13});