function toggleVis(strClass, currMenu, amountMenues) {
  strCurrElem = strClass + currMenu;
  // Id of the cirrent menu. Something like 'picture_menu2'.
  
  for (var i = 1; i <= amountMenues; i++)
  {
    if (currMenu != i)
    {
      // We don't have the current menu. Don't display it.
      GL_getObjCss(strClass + i).visibility = 'hidden'
    }
    else
    {
      // We have the current menu. Toggle it!
      if (GL_getObjCss(strCurrElem).visibility == 'hidden') {
        GL_getObjCss(strCurrElem).visibility = 'visible'
      }
      else
      {
        GL_getObjCss(strCurrElem).visibility = 'hidden'
      }
    }
  }
}