Eu recomendaria a dares uma vista de olhos em janelas modais.
http://www.webdesignerdepot.com/2012/10/creating-a-modal-window-with-html5-and-css3/
podes ver aqui a diferença entre o lightbox e a janela modal.
https://ux.stackexchange.com/questions/90336/whats-the-difference-between-a-modal-popup-popover-and-lightbox
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