jQuery to post data without leaving page & textarea?

var editor = $('.jquery_ckeditor').ckeditorGet();
alert( editor.checkDirty() );

// Get the editor data.
var data = $( 'textarea.editor' ).val();

   var messagecontent = $("input#messagecontent").val();
   if (messagecontent == "" ) {
   $("label#messagecontent_error").show();
   $("label#messagecontent").focus();
   return false;
   }