Jquery UI - 4 problems to solve

hi, please have a look at this: [login to view URL] There are a few problems that we want you to solve: Problem #1: You will find it is very difficult to drop any item into any container or blue container into pink container whether it is previously empty or not. When sorting existing items within containers, this problem does not exist but when trying to sort-in new items or containers into containers sorting is very difficult... Video: [login to view URL] To reproduce, please do the following: Drag/drop any green ITEM out of any RED colored zone into any pink or blue container or Drag/drop any green ITEM out of any pink or blue container into any other pink or blue container Problem #2: The blue container (b), expands to make space in order to accept container (a), this is a wrong behaviour as the blue container is not supposed to accept blue containers but only green colored items.. Video: [login to view URL] Info: 1. Blue containers should not accept any other blue containers but only contain green items 2. Only pink containers can contain blue containers and green items but no other pink containers... 3. Pink containers should not accept other pink container To reproduce, please do the following: Try to drag- / drop any blue container (a) into any blue container (b) Problem #3: Script does not save position of item... Video: [login to view URL] To reproduce this problem, please do the following: 1. drag-/drop an item into another tab 2. open the tab you dropped that item in 3. drag-/drop the item from the first red zone (default landing zone) into the 2nd or 3rd zone to the bottom, last in order 4. refresh (F5) Problem #4: Items (green) and Containers (blue/pink) can not be dragged/dropped onto first position in the left drop zone.. Video: [login to view URL] To reproduce this problem, please do the following: 1. Drag- and drop any blue container into the left red drop-zone. 2. Now try to move it to the top, the first position, you will see that the item or container would jump back to its former position. Your bid is warmly welcome if: - you make mention of JQUERYUI in your bid in order to verify that you've read this entire description - if you have a lot of jquery ui experience - accept payment after work done! - if you think you can solve at least 1 or 2 of or all of the bugs (please let us know in advance) - if you think you could write a better code and stay within our budget - if you have the time and skills to complete this project within a short time