Print head alignment question?

I have a Canon i850 printer and I am trying to do the print head alignment. It prints me out this page of different patterns but I don't understand wtf I am supposed to be looking for. Am I supposed to pick the one that has the most uniform lines or the most solid block with no line or ??. This is really confusing and I can't find any information on the net about it. Any help is appreciated.

it just prints out a test page, while it prints that page it tweaks it self and aligns

No it doesn't cause it asks me to pick a letter and a number that looks the best or correct or whatever. Some auto align but this one does not.

Pick the one that has the least overlapping and no gaps...in other words, a solid block.

If you wanna see how bad my print head alignment printouts are/were, take a look at http://forums.redflagdeals.com/showthread.php?t=83740

For each letter there should be three lines of the same length. Pick the one where all three lines join to make one long line.