Great tool.
I have one comment and some sugestions.
HP calculator has 1 HP error in my case, but as it is, is great. If any of you think it would help, I can give you screens with my skills so the function can be better interpolated.
A section with curent skills value, would be much apreciated.
The text boxes we have to fill I suppose are in a table or in a list - depends on whant CSS or html u use. U could change the background of succesive rows for better reading, beacause you have to be extra carefull not to fill a diferent skill box.
I can't upload the skills on PE-wiki, but a way of saving the skills and adress them from my PC with cookies or something would be verry nice. Ofcourse, if is to much trouble, you don't have to implement all that. Is great as it is.
The posibility calculating the efect of chipping a particular skill would be nice. Now we have to use a hac to do it... It works only if you empty all other skill boxes, take the final value of TT chip you whant to chip, copy that and then fill all the other boxes with corect values... Lot of work