I want to code a page index.html, when loading this page, we will show a child form, its name is child.html, and disable body of index.html, when i closed child form, the index.html must be enable. This resembles Daniweb page, when i click member login.... Everybody can tell me a solution ? Thanks to all who are interested in this thread. :icon_smile:

The technique you are looking for is called a Lightbox, which uses JavaScript. This tutorial may help (I haven't read it yet, but it looks like it accomplishes your goal. You may want to click the "create a lightbox with fade in effect" link first to see how they made the original one):
http://www.xul.fr/javascript/lightbox-form.html

Thanks EvolutionFallen, Lightbox was what i was looking for. Thanks a lot.