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I have a multiselct grid. But I can't figure out how I can post the rows ID' back in a post by using grid AJAX engine.

Basically you need to do next:

a) define callback function

            function my_callback(){

             }

b)  create ajax object

            var ajax=new dtmlXMLLoaderObject(my_callback);

c)  send request

            for get

                        ajax.loadXML("my_xml.php?a=1&b=2");

                                   //  $_GET["a"] $_GET["b"]

            for post

                        ajax.loadXML("my_xml.php?a=1&b=2",true,"c=3&d=4");

                                   //  $_GET["a"] $_GET["b"]

I hope this information will be enough for you. But you also can have a look at web ui toolkit and free javascript calendar download.