text: // http://akelpad.sourceforge.net/forum/viewtopic.php?p=11387#11387
  // http://infocatcher.ucoz.net/js/akelpad_scripts/tabsNextPrevious.js
  // https://github.com/Infocatcher/AkelPad_scripts/blob/master/tabsNextPrevious.js
  
  // (c) Infocatcher 2011, 2014
  // Version: 0.1.2 - 2014-03-03
  // Author: Infocatcher
  
  //===================
  //// Switch between tabs in order of them usage (temporary check "Switch tabs: next-previous" option)
  // Based on Instructor's code: http://akelpad.sourceforge.net/forum/viewtopic.php?p=4222#4222
  // Proposed hotkeys: Ctrl+PageDown and Ctrl+PageUp
  
  // Usage:
  //   Call("Scripts::Main", 1, "tabsNextPrevious.js")           - switch to next tab
  //   Call("Scripts::Main", 1, "tabsNextPrevious.js", "-prev")  - switch to previous tab
  //===================
  
  var next = WScript.Arguments.length ? WScript.Arguments(0) != "-prev" : true;
  
  var hMainWnd = AkelPad.GetMainWnd();
  
  if(hMainWnd && AkelPad.IsMDI()) {
  	var tabOpts = AkelPad.SendMessage(hMainWnd, 1222 /*AKD_GETMAININFO*/, 157 /*MI_TABOPTIONSMDI*/, 0);
  	var forceNextPrev = !(tabOpts & 0x10000 /*TAB_SWITCH_NEXTPREV*/);
  	if(forceNextPrev)
  		AkelPad.Command(4310 /*IDM_WINDOW_TABSWITCH_NEXTPREV*/);
  
  	selectTab(next);
  
  	if(forceNextPrev)
  		AkelPad.SendMessage(hMainWnd, 1219 /*AKD_SETMAININFO*/, 157 /*MIS_TABOPTIONSMDI*/, tabOpts);
  }
  else {
  	AkelPad.MessageBox(hMainWnd, "MDI or PMDI window mode required!", WScript.ScriptName, 48 /*MB_ICONEXCLAMATION*/);
  }
  
  function selectTab(next) {
  	var cmd = next ? 4316 /*IDM_WINDOW_FRAMENEXT*/ : 4317 /*IDM_WINDOW_FRAMEPREV*/;
  	AkelPad.SendMessage(hMainWnd, 273 /*WM_COMMAND*/, cmd, 0);
  }