jQuery Alert Dialogs aims to replace the basic functionality provided by the standard JavaScript alert(), confirm(), and prompt() functions. These are completely customizable via CSS (which can make your apps look much more professional). And you can set a custom title for each dialog.

These methods simulate a true modal dialog box. They will automatically re-position themselves if you resize the browser window. If you include the jQuery UI Draggable plugin, the dialogs can be moved by dragging their title bars. Unlike their native JavaScript counterparts, you can use HTML in the message parameter. To specify a newline, you can use either \n or <br />.

Requirements: jQuery Framework
Demo: http://abeautifulsite.net/blog/2008/12/jquery-alert-dialogs/
License: GPL License