GL_CLIP_PLANE not working

My OpenGL clipping plane doesn't work--can anyone tell me what I am doing wrong? here is my code:

Code:

	double eqr[] = {0.0f, -1.0f, 0.0f, 0.0f};	// clip plane equation
	glLoadIdentity();			// reset the view
	glTranslatef(0.0f, -0.6f, zoom); // move down a bit and back by the value in zoom
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.
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	glEnable(GL_CLIP_PLANE0);					// enable clipping
	glClipPlane(GL_CLIP_PLANE0, eqr);			// tell opengl where we want to clip


	
	glPushMatrix();								// push the matrix
		glScalef(1.0f, -1.0f, 1.0f);			// mirror everthing (it's supposed to be a reflection, after all)
		
		glLightfv(GL_LIGHT0, GL_POSITION, light_pos);	// set up light 0
		glTranslatef(0.0f, height, 0.0f);		// move to where we want to draw the ball (opposite, because it's mirrored)
		glRotatef(xrot, 1.0f, 0.0f, 0.0f);		// rotate on the x axis
		glRotatef(yrot, 0.0f, 1.0f, 0.0f);		// rotate on the y axis
		draw_object();							// now draw the ball
	glPopMatrix();								// pop the matrix


	glDisable(GL_CLIP_PLANE0);					// disable clipping
	glDisable(GL_STENCIL_TEST);					// turn off the stencil buffer

The idea is to draw a hovering ball above a floor, and, using the stencil buffer, draw a reflection of the ball. draw_object() draws the ball. It's supposed to clip to keep the reflection on the floor like an accurate reflection would . Everthing works, except the clipping. (I'm not sure if my picture attachment will come through or not)

1) that plane equation looks fishy to me, but that may just be me
2) I noticed that code doesn't enable the stencil test
3) Are you certain the stencil buffer is being filled?

Yeah, I think there's something wrong with my stencil buffer, because having played around with the clipping equation, there's nothing wrong with the plane clipping. So I guess I'll have to figure out what I'm doing wrong with my stencil buffer.