Gonna be straight:
The edges cross between eachother when bridged. Details on the picture.

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might be something wrong with ure mesh...cant see the whole object that u have...i normally just turn on 3d snap and drag one edge to the other and weld the vertices.

That’s probably because of the normals.
Check that the two polys which edges you’re trying to bridge are either facing each other or facing away from each other.
Right now you’re trying to create a continuity between internal and external surfaces, so to speak.
Just select one of the elements and flip its normals.

max 9
Photoshop CS3
Windows XP
tin box + plug
Wacom Intuos3

As Caprier said its the normals. select by element then “flip” the one that’s facing the wrong way.  When they’re selected a bright red selection indicates the direction the normal is facing, if you have a dark red it means they’re backwards

Quad Core Xeon X5355 - 8GB DDR2 - nVidia Quadro FX 4600 - 3Ds Max 2010

Worked, great.
Wasn’t the first time I had this problem, I almost thought there werent solution.
Thx guys.