How would I create a javascript upload modal box?

how can I make a java script modal box开发者_StackOverflow that uploads an image to the site and then inserts the url into a textbox in html/php? I think this is what they are called, I mean the "pop up box inside the browser thing"!

Thanks, Cameron

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davidwalsh.name/facebook-lightbox

Have a look at the link. It may be of help.

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Use Fancybox or colorbox, they are simple and easy to integrate