2001 Impala Headlight Adjustment

Just purchased new headlights for my 2001 Impala. How do you adjust the headlight alignment? Thanks.

Keith

Im not sure how to adjust it horizontally or if you can, but turn this screw for vertical alignment
http://i232.photobucket.com/albums/ee46/MaImpala/2002%20Impala/100_2897-1.jpg

I think the horizontal adjuster is down in behind the headlight assembly. Just look for another screw head just like that one.