Ive been researching for weeks trying to find a decent shopping cart software that I can fully customise, have customer accounts etc but I just cant seem to get my head around them - any recommendations are welcome!

So I'm considering scripting my own, i have some php books that have scripts but I'm not all that good with understanding how databases work, they never seem to link to the script when i have a go.

Need urgent help!!

Thankyou