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Hi Miro,
The bokeh effect that's created on that website is basically what you already have but without the inner/our glow. The glow you want to create is with big blurred botches of white that all have low opacity.
Look at this one: http://buildinternet.com/wp-content/uploads/envato-thumb.jpg Much more simple and effective (or better said realistic).
Good luck & Happy Easter :)

Thank you, Noel. I just found masses of tutorials and brushes for this http://www.photoshopwebsite.com/photoshop-tutorials/15-bokeh-effects-photoshop-tutorials-100bokeh-brushes-for-free-download/
Happy Easter to you too!