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$(function() {

    //hang on event of form with id=myform
    $("#myform").submit(function(e) {

        //prevent Default functionality
        e.preventDefault();

        //get the action-url of the form
        var actionurl = e.currentTarget.action;

        //do your own request an handle the results
         $.ajax({
                url: actionurl,
                type: 'post',
                dataType: 'json',
                data: $("#myform").serialize(),
                beforeSend:function(){
                    launchpreloader();
                },
                complete:function(){
                    stopPreloader();
                },
                success: function(data) {
                    // ... do something with the data...
                }
            });

    });

});

// via http://stackoverflow.com/questions/1200266/submit-a-form-using-jquery