Icecreamy
I did see that there was a slight problem with the masteries since Janna won't be dying very often she can use those 3 points otherwise, so I spread out movement speed, XP gain and health regan since she'll have a huge mana pool and more mana regan to help maintain spamming.

Thank you for your comments, As for the rune setup I actually agree that there could be a better use for the seals such as Mana regan and changed it on the guide, I was just putting so much emphasis on the Gold per 10 rule and got carried away.

As for the coding I'm just not that familiar with it and don't know anyone who is so I took my chance at making the guide. With the Exp issue Janna doesn't need to be a high level as long as she has access to all of her skills, obviously the higher skill level would be nice but it's not as needed on her as it would be on other characters. Also Magic Pen wouldn't be as helpful on Janna because she's not going to be doing much damage anyways.

You should try to get some BBCoding in there, it will make your guide look a lot better. At the moment it seems like a big wall of text... Click the first link in my signature for more info about it! :)

For the rest, I think that your masteries are a bit off - if you go 21 points in utility you should really put 4 in Awareness . Since you will be out of lane warding all the time, you will lose a lot of xp. The time you are in lane, you therefore want to gain more xp.

I believe mana/lvl runes are quite bad. I'd prefer Armor, Magic Resist or Magic Penetration Marks and Glyphs.

Nice Guide, I mainly play Sona/Soraka Support and been trying Janna recently your guide gave me some extra insight but not overly much I'm afraid :(

Also with the runes, I've been experimenting myself and I found that the gp/5 seals are best as a replacement for a quint since 2.25gp/5 is pretty pathetic considering are missing out on survivability + Highly important Mgen. So I personally prefer using the seals as a way to replace one Quint for more survivability/sustain.

Mejais also seems a bit wierd, since you'd be grabbing Oracles whenever possible making yourself a bigger target isn't generally what I prefer D;.

Oh well still a good guide, keep updating ^.^

True it could be used to buy the mana potion but I'd rather save it since I don't typically spam that early. Once I hit level 3 the spells start to come out more and by then I've finished Philostone which has mana regan and I usually don't have to many mana problems since i'd have to go back to shop/heal anyways. Janna in general can use a ton of mana if she starts spamming

I def agree using CV up top and finding the jungler but I don't really see much ganking before level 3 anyways and by then I have my first wards out and I'm always CVing up top anyways.

your item build says to start with a regrowth pendant which costs 435 gold. you have 40 more gold left which could be used on say a mana potion. I know it may sound dumb but Janna is mana dependant and sometimes you will be low on mana. You don't actually have sufficient manaregens at all. I also play Janna as well and trust me I don't spam spells but when it matters most, without enough mana regen, you will not have enough mana for the next assault to protect your carry or even turn back and take them down. A higher mana pool is nice but even if you have a lot of mana and you cant regenerate it back quickly enough, you are a going to be useless babysitter.

I honestly recommend starting with Faerie Charm to get some mana regen. This also allows you to buy some wards. Your above build will not allow you to buy wards. CV alone isnt sufficient. If you are going to use it constantly to check the lower half of the river, your mid and top laners will be at risk. Instead you should use cv across the map, for all people. However, have a ward to protect you so you can focus on finding that jungler.