ISMOUSEAT()

  Short:
  ------
  ISMOUSEAT() Checks for mouse click within passed coordinates

  Returns:
  --------
  <lClicked> => true if mouse click occured within the passed
                coordinates

  Syntax:
  -------
  ISMOUSEAT(nMouseRow, nMouseCol, nTop,nLeft,nBottom,nRight)

  Description:
  ------------
  Checks <nMouseRow>, <nMouseCol> against the coordinates
  <nTop>, <nLeft>,<nBottom>,<nRight> and returns True if the
  mouse row and col are within the screen coordinates.

  Examples:
  ---------

  case ISMOUSEAT(nMouseR, nMouseC, nBot+2, nLeft, nBot+2, nLeft+2)
     oTb:up()

  Source:
  -------
  S_MOOSE.PRG