a img { border:none; }

.contenedor { width:1000px; margin-left:auto; margin-right:auto;}
.contenedorF{ width:1000px; float:left; background-image:url(../img/bannertop.png); background-repeat:no-repeat; margin-top:20px;}
.footer { width:1000px; background-image:url(../img/footer.png); height:60px; background-repeat:no-repeat; float:left;} 
.campo { background-image:img/trans.png; height:20px; width:50px; float:left;}