background: url(images/bg.jpg) no-repeat;
-webkit-background-size: 400px 80px;
-moz-background-size: 400px 80px;
-o-background-size: 400px 80px;

background: url(images/bg.jpg) no-repeat;
-webkit-background-size: 50% 50%;
-moz-background-size: 50% 50%;
-o-background-size: 50% 50%;