Gel Electrophoresis! Anode/Cathode??

Well, I know gel electrophoresis works like an electrolytic cell, meaning the anode is +ive and cathode is -ive. 1) So which direction do things flow in gel electrophoresis? Does it depend on charge? (I know it depends on weight also but let's say we're talking about charge only here) Anything else thats important to know about gel electrophoresis? 2) Isoelectric points! These confuse the hell out of me. Consider an amino acid... its the point where the OH group is -ive and the... Gel Electrophoresis! Anode/Cathode??
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