Hi guys - im almost embarassed to ask this, cus ive done quite a lot of OpenGL but for some reason this has got me really stumped

Im trying to draw a simple quad and set the camera to look directly down on it, im using the following code and it just brings up a blank screen:
gluLookAt(4.5, 10, 7.5, 4.5, 0, 7.5, 0, 1,0);
glColor3f(1,0,0);
glBegin(GL_QUADS);
glVertex3f(0,0,0);
glVertex3f(9,0,0);
glVertex3f(9,0,15);
glVertex3f(0,0,15);
glEnd();
Im using the nehe base code and any other drawing stuff works (ie nehe examples).
What stupid mistake am I making?

Thanks for any help!