JQuery Ajax Submit Twice?

JQuery Ajax Submit Twice?

Could someone point me in the right direction?

When I try to submit my jquery form the 2nd time it sends the data twice in one go. This is the same for 3rd (3x) and fourth+ (4x) and wonder whether the data/cache needs to be cleared each time I submit? Any guidance would be extremely grateful.

// Ajax Call (Uses JQuery Boxy Form) // 
  1. $(document).ready(function() {
     $('#createlecture').click(function() {
     var dialogbox = new Boxy('#dialog',{
     title: 'Create a new lecture',
     modal: true,
     cache: false,
     behaviours: function(c) {
     c.find('#lectureform').submit(function() {
     var lectureTitle = $('#lectureTitle').val();
     var lectureDescription = $('#lectureDescription').val();
     var courseID = $('#courseID').val();
     var moduleID = $('#moduleID').val();
     
     var dataString = 'lectureTitle=' + lectureTitle + '&lectureDescription=' + lectureDescription + '&courseID=' + courseID + '&moduleID=' + moduleID;
     //alert(dataString);
     if(courseID == 'None') {
     Boxy.alert("Select course");
     return false;
     }
     
     // Ajax Start 
     $.ajax({
     type: "POST",
     url: "MYPOSTURL",
     data: dataString,
     complete: function() {
     $("section").load("MYHTMLFILE", {limit: 250}, function(){
     dialogbox.hide();
     });
     return false;
     }
     });
     });
     }
     }); // New Boxy Close
     return false;
     }); 
    });