Javascript - Drag´n´Drop Script

At first here is my Fiddle:

So maybe it won´t work on Fiddle because the window size is too small. Here are the problems I have and I can´t solve after trying it for 8 days -.- . 1.Deactivate Drag option after once dropped: So once an item was dropped it shouldn´t be draggable anymore , so how is it possible to do this? 2.I can´t drop my items in the e.g. 6. or 7. row. 3.Everytime I try to add instead of a text in the header an image it won´t appear. 4.Also my footer doesn´t appear.

I hope someone can help me please, And sorry for my bad english :| Greetz

via Chebli Mohamed