function TbsSearchInFiles($files, $str, $returnFirstFound = true) {

		$keys_ok = array();

		// transform the list of files into a list of available idx
		$keys_todo = array();
		$idx_keys = array();
		foreach($files as $k=>$f) {
			$idx = $this->FileGetIdx($f);
			if ($idx!==false) {
				$keys_todo[$k] = $idx;
				$idx_keys[$idx] = $k;
			}
		}

		// Search in the current sub-file
		if ( ($this->TbsCurrIdx!==false) && isset($idx_keys[$this->TbsCurrIdx]) ) {
			$key = $idx_keys[$this->TbsCurrIdx];
			$p = strpos($this->TBS->Source, $str);
			if ($p!==false) {
				$keys_ok[] = array('key' => $key, 'idx' => $this->TbsCurrIdx, 'src' => &$this->TBS->Source, 'pos' => $p, 'curr'=>true);
				if ($returnFirstFound) return $keys_ok[0];
			}
			unset($keys_todo[$key]);
		}

		// Search in the store
		foreach($this->TbsStoreLst as $idx => $s) {
			if ( ($idx!==$this->TbsCurrIdx) && isset($idx_keys[$idx]) ) {
				$key = $idx_keys[$idx];
				$p = strpos($s['src'], $str);
				if ($p!==false) {
					$keys_ok[] = array('key' => $key, 'idx' => $idx, 'src' => &$s['src'], 'pos' => $p, 'curr'=>false);
					if ($returnFirstFound) return $keys_ok[0];
				}
				unset($keys_todo[$key]);
			}
		}

		// Search in other sub-files (never opened)
		foreach ($keys_todo as $key => $idx) {
			$txt = $this->FileRead($idx);
			$p = strpos($txt, $str);
			if ($p!==false) {
				$keys_ok[] = array('key' => $key, 'idx' => $idx, 'src' => $txt, 'pos' => $p, 'curr'=>false);
				if ($returnFirstFound) return $keys_ok[0];
			}
		}

		if ($returnFirstFound) {
			return  array('key'=>false, 'idx'=>false, 'src'=>false, 'pos'=>false, 'curr'=>false);
		} else {
			return $keys_ok;
		}

	}