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From the head section of the page containing the form #reqFormID:

<script type="text/javascript">
    $(document).ready(function() {

        $("#reqFormID").validationEngine({
            ajaxSubmit: true,
            ajaxSubmitFile: "site-helper.php",
            ajaxSubmitExtraData:"action=submit-reqform",
            ajaxSubmitMessage: "Thank you, a representative will contact you shortly.",
            success :  function() { $("#inside_lower_container").animate({height:555},400); } ,
            userSubmitFX : function() {
                $(".submit").attr('value','Sending...');
                $(".submit").attr('disabled','disabled');
            },
            userSubmitFXFail : function() {
                $(".submit").attr('value','Submit Failed');

                window.setTimeout(function() { // maybe the issue is gone - allow click
                    $(".submit").attr('value','Submit') ;
                    $(".submit").attr('disabled', '');
                }, 30000);
            },
            failure : function() { // validation error - allow click
                $(".submit").attr('value','Submit');
                $(".submit").attr('disabled', '');
            }
        })
    });
</script>

Relevant changes to jquery.validationEngine.js:

LINE 22:

    settings = jQuery.extend({
        allrules:allRules,
        validationEventTriggers:"focusout",
        inlineValidation: true,
        returnIsValid:false,
        liveEvent:true,
        unbindEngine:true,
        containerOverflow:false,
        containerOverflowDOM:"",
        ajaxSubmit: false,
        scroll:true,
        promptPosition: "topRight", // OPENNING BOX POSITION, IMPLEMENTED: topLeft, topRight, bottomLeft, centerRight, bottomRight
        success : false,
        userSubmitFX : function() {},
        userSubmitFXFail : function() {},
        beforeSuccess :  function() {},
        failure : function() {}
    }, settings);

LINE 70:

    $(this).bind("submit", function(caller){   // ON FORM SUBMIT, CONTROL AJAX FUNCTION IF SPECIFIED ON DOCUMENT READY
        $.validationEngine.onSubmitValid = true;
        $.validationEngine.settings = settings;

        // invoke user effects for submit button
        settings.userSubmitFX && settings.userSubmitFX();

        if($.validationEngine.submitValidation(this,settings) == false){
            if($.validationEngine.submitForm(this,settings) == true) return false;
        }else{
            settings.failure && settings.failure();
            return false;
        }
    })

LINE 393:

            $.ajax({
                type: "POST",
                url: $.validationEngine.settings.ajaxSubmitFile,
                async: true,
                data: $(caller).serialize()+"&"+extraData,
                error: function(data,transport){ $.validationEngine.debug("error in the ajax: "+data.status+" "+transport) },
                success: function(data){
                    if(data == "true"){         // EVERYTING IS FINE, SHOW SUCCESS MESSAGE
                        $(caller).css("opacity",1)
                        $(caller).animate({opacity: 0, height: 0}, function(){
                            $(caller).css("display","none");
                            $(caller).before("<div class='ajaxSubmit'>"+$.validationEngine.settings.ajaxSubmitMessage+"</div>");
                            $.validationEngine.closePrompt(".formError",true);
                            $(".ajaxSubmit").show("slow");
                            if ($.validationEngine.settings.success){   // AJAX SUCCESS, STOP THE LOCATION UPDATE
                                $.validationEngine.settings.success && $.validationEngine.settings.success();
                                return false;
                            }
                        })
                    }else{                      // HOUSTON WE GOT A PROBLEM (SOMETING IS NOT VALIDATING)
                        data = eval( "("+data+")");
                        if(!data.jsonValidateReturn){
                             $.validationEngine.debug("you are not going into the success fonction and jsonValidateReturn return nothing");
                        }
                        errorNumber = data.jsonValidateReturn.length
                        for(index=0; index<errorNumber; index++){
                            fieldId = data.jsonValidateReturn[index][0];
                            promptError = data.jsonValidateReturn[index][1];
                            type = data.jsonValidateReturn[index][2];
                            $.validationEngine.buildPrompt(fieldId,promptError,type);
                        }

                        // call function to modify submit button on failure
                        $.validationEngine.settings.userSubmitFXFail && $.validationEngine.settings.userSubmitFXFail();
                    }
                }
            })