.bk_top{background:transparent url(/images/container_general_top.gif) no-repeat 0 0; padding:12px 0 0 15px; height:32px; position:relative; z-index:1; }
.bk_bottom{background:transparent url(/images/container_general_bottom.gif) no-repeat 0 0; height:25px;}
.titulo{background-color:#ffffff; width:513px;}
.contenido{background-color:#ffffff; padding:15px; width:483px; margin:-10px 0 -10px 0; ; _margin:0; /*padding:0 9px;*/  position:relative; z-index:0; }