NAME: DetectGraph

     USE: Procedure that checks the hardware and determines which graphic
          driver and ode to use.  The procedure InitGraph will call
          DetectGraph if no values are given.

     DEPENDENCY:  Must first be in graphics mode.  The unit Graph
                  must also be placed in the uses section.

     SYNTAX: DetectGraph(GraphDriver, GraphicsMode);
             DetectGraph(Integer, Integer);