.banners{position:relative; float:left; width:650px; height:364px; background:url(banners.jpg) no-repeat;}

.banner_editor{position:relative; float:left; width:431px; height:178px; margin-bottom:8px; cursor:hand;}
.banner_cuadrado{position:relative; float:left; width:211px; height:178px; margin-bottom:8px; cursor:hand;}

.espacio{position:relative; float:left; width:7px; height:178px; /*background-color:green;/*}