how to change the background color in jquery

1$(document).ready(function() {
2  $("button").mouseover(function() {
3    var p = $("p#44.test").css("background-color", "yellow");
4    p.hide(1500).show(1500);
5    p.queue(function() {
6      p.css("background-color", "red");
7    });
8  });
9});
10

1$("#co").click(function(){
2   $(this).css({"backgroundColor" : "blue"});
3});