******** fig6.26 **********

	PRIORITY_QUEUE
	merge( PRIORITY_QUEUE H1, PRIORITY_QUEUE H2 )
	{
/*1*/		if( H1 == NULL )
/*2*/			return H2;
/*3*/		if( H2 == NULL )
/*4*/			return H1;
/*5*/		if( H1->element < H2->element )
/*6*/			return merge1( H1, H2 );
		else
/*7*/			return merge1( H2, H1 );
	}