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4 verts but how to do tri's

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Hi, ive managed to get my model loading class working. But the problem is, is that the .obj modeler (anim8or). Makes the obj files store four verts too a face, not 3. This has problems, as i dont kno what too use in my vertex array. It works alright with GL_QUADS, but when the face has like 5 verts, it goes pear shaped. anyone got any ideas how i maybe should rearange the data to make tri's? thx

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if your face is convex, and have vertices v0,v1,v2..v[n-1]
you can draw it as triangles if you draw triangles with vertices
v0 v1 v2
v0 v2 v3
v0 v3 v4
v0 v4 v5
v0 v[n-2] v[n-1]
where v[] is array that contains vertices of face, and n is number of vertices in face.

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