How to discard selected feature in openLayers?

This is my website for test: http://ift.tt/1A5QrDX

This is my expected result:http://ift.tt/1BNzCeZ

I want to try this effect in openLayers.

If the feature is selected, I click again to unselect the feature and click out not to unselect the feature.

I tried it whole day. Please help me to solve this problem.