I can only speak for the plugin I recommended, the Form Plugin. I think the documentation (http://malsup.com/jquery/form/) covers most of this, but I'll try and answer your questions here:
> So, do these plugins actually create the iframe for me? Yes. > What do I have to do to get it to submit it into the iframe? > I how do I specify which script processes the post into the iframe? This is an example from the document (with names slightly modified and a file input added): <head> <script type="text/javascript" src="path/to/jquery.js"></script> <script type="text/javascript" src="path/to/form.js"></script> <script type="text/javascript"> // wait for the DOM to be loaded $(document).ready(function() { // bind 'myForm' and provide a simple callback function $('#myForm').ajaxForm(function() { alert("File uploaded!"); }); }); </script> </head> <form id="myForm" action="uploadFile.php" method="post"> File: <input type="file" name="myfile"> <input type="submit" value="Upload file"> </form> Karl Rudd