Error changing background image

Error changing background image

I'm trying to change the background image of a different page through
jQuery with an overlay, though, I'm doing something wrong. Can someone
please point out what I'm doing wrong?
$("html").css({"background-image": "url("+../images/pattern copy.png+")",
"url("+../images/visuals/visual3-edit.jpg+")", "center" "center" "fixed
no-repeat;"});
I hope I'm using StackOverflow correct, it's the first time I'm attempting
this.
Kind regards.