Your hit% and an enemy's dodge% is completely independent of each other and are separate rolls altogether. The proof for this is that you can either MISS the enemy (your hit% fails and MISS appears on top of your head), OR the enemy's DODGE succeeds (your hit% succeeded but then the enemy's dodge roll comes into play and succeeds, and DODGE appears on top of the enemy's head).
Very simply put:
http://img.photobucket.com/albums/v8.../algorithm.jpg
If hit% and enemy dodge% were in the same equation and you happened to fail your attack, you wouldn't know whether you MISSED or the enemy DODGED due to a hit% fail or a dodge% success.
Btw - which roll comes first doesn't matter - The enemy dodge roll may come before your hit% roll, but the outcome is the same: 2 rolls, independent from each other, are calculated in succession.