How to add a close button to Bootstrap Popover

Recently I had to build a ‘smart booking form’ for a group of hotels. The website is made on Twitter’s Bootstrap and is fully responsive.
Troubles began when I had to ask the guest for his children’s age, only if he’s telling the form he has children.

Here the Twitter Popover feature comes very handy: if the guest selects one or more children a popover will be shown.

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