session_start(); if($_REQUEST["back"]){ $miFondo="imagenes/fondogeneral".$_REQUEST["back"].".jpg"; $varFondo=$_REQUEST["back"]; $_SESSION["fondo"] = $miFondo; }else{ if($_SESSION["fondo"]){ $miFondo = $_SESSION["fondo"]; }else{ $miFondo="imagenes/fondogeneral1.jpg"; } } ?>