/*body{margin:0 0px; padding:0;font-family:Helvetica;font-size:12px;background:url(../images/fondos.jpg)}*/
body{
background: url(../images/fondos.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;}