subir imagen de perfil segun usuario

[ofertasdiarias]

y esta es la otra pagina donde se ve la imagen.:

Código PHP:

<?php require_once('Connections/hoysale.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
 
  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);
 
  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}
 
$varusuario_un = "-1";
if (isset($_SESSION['MM_Username'])) {
  $varusuario_un = $_SESSION['MM_Username'];
}
mysql_select_db($database_hoysale, $hoysale);
$query_un = sprintf("SELECT * FROM cambiar_cabezera_usuario WHERE cambiar_cabezera_usuario.id_registro AND cambiar_cabezera_usuario.id=%s", GetSQLValueString($varusuario_un, "int"));
$un = mysql_query($query_un, $hoysale) or die(mysql_error());
$row_un = mysql_fetch_assoc($un);
$totalRows_un = mysql_num_rows($un);
 
mysql_free_result($un);
?>
<img src="<?php echo $row_un['imagen']; ?>" width="100" height="100">
 

porfavor ayuda!!!