That map is false. learn a bit of history before you re-post something you saw on Facebook/twitter.
Before 1948 the entire area belonged to the british mandate.
Between 1948 and 1967 the west bank belonged to Jordan and Gaza belonged to Egypt.
When the treaties with Jordan and Egypt were signed - they didnt want the west bank and gaza back. (currently the hamas is considered a terrorist organisation by egypt since the hamas is aiding the muslim brothers in sinai against the egyptian government)
the current map:
Here is what the egyptians think about the hamas:
http://www.youtube.com/watch?v=7VtENBF_yjo
Here is what the palestinian representative in the UN thinks about his government. It is literally his job to defend them:
http://www.youtube.com/watch?v=DjzS27ylCZ8
On topic: AFAIK Israel did not deny the hit. The IDF warned the residents and told them to evacuate from the area. The hamas has urged the civilians to stay put and act as human shields.
http://www.memritv.org/clip_transcript/en/4340.htm
Unfortunately the civilians decided to ignore IDF's warnings and obey the Hamas request.