Solar Panel Direction

Im looking to build a solar charger for my ipod and phone. How do i build one?
So far i have come across some direction at
http://yosemiteoutside.com/m/Blogs/02EA4A6B-8893-4F3E-87A8-C1E4B24C3AAB_files/shapeimage_1.png
But i would like to change this a bit if possible. My goal is to have the Solar Panel charge a battery during the day that would then charge my phone and ipod when i get home from work in the evening. From what i understand the voltage regulator keeps a contant voltage and amperage going into the ipod so you do not burn it up. What do i need to change to be able to charge a battery? What do i need to do to have in line after the battery to charge my devices?
no idea
but it is probably possible.........
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