function thumb($imgurl, $width, $height, $bg = true)  {  global $cfg_mainsite,$cfg_multi_site;  $thumb = eregi("",$imgurl)?str_replace($cfg_mainsite,'',$imgurl):$imgurl;  list($thumbname,$extname) = explode('.',$thumb);  $newthumb = $thumbname.'_'.$width.'_'.$height.'.'.$extname; if(!$thumbname || !$extname || !file_exists(DEDEROOT.$thumb)) return $imgurl;  if(!file_exists(DEDEROOT.$newthumb)) {  include_once DEDEINC.'/image.func.php';  if($bg==true)  {  ImageResizeNew(DEDEROOT.$thumb, $width, $height, DEDEROOT.$newthumb);  }  else  {  ImageResize(DEDEROOT.$thumb, $width, $height, DEDEROOT.$newthumb);  }  }  return $cfg_multi_site=='Y'?$cfg_mainsite.$newthumb:$newthumb;  }