oh I haven't noticed much different between png. and jpg. I use only Gimp 2 + Photofiltre studio X for picture editing. I have also photoshop, but it still unknow for me to use. thanks that note. I will keep it in mind.
Hey Noif, just a note-
You use Photoshop/GIMP for your pictures, right? Save them as .PNG, not .JPEG - every time you save a JPEG the quality of the image is reduced. PNGs preserve nearly everything, on the other hand. :