Flipping x,y axes in OpenGL

I want to flip the y axis in OpenGL to look like PyGame, where (0,0) is the top left corner and (0, height) is the lower left corner.
Is this possible?

This is how I initialize graphics:

glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluOrtho2D(0, w, 0, h)
glMatrixMode(GL_MODELVIEW)

My definition of Quads:

glBegin(GL_QUADS)
glTexCoord2f(0,0); glVertex2f(0,0)
glTexCoord2f(0,1); glVertex2f(0,height) 
glTexCoord2f(1,1); glVertex2f(width, height)
glTexCoord2f(1,0); glVertex2f(width, 0)
glEnd()