Incrementing a var field

Hi,

I have a script which is taking a value from a integer field into var QACurrentCounter and then creating a new var QANewCount by incrementing the result of the original field by 1. 

Seems to work ok when the original value is 0 but when the original value is 1 the result comes out as 11.  I am assuming that the var is holding the value as a string but can't find any help as to what I need to do to keep it as a integer value.

function ChangeAssField(type, fld)  {   var CurrentRec = nlapiGetRecordId();     if (fld=='custrecord_bsb_assessor')   {          var AssRecord_id = nlapiGetFieldValue('custrecord_bsb_assessor');    var OrigRec = nlapiLoadRecord('customrecord_bens_sandbox', CurrentRec);      //Capture Original Record    var AssRec = nlapiLoadRecord('customrecord_assessor_record', AssRecord_id);     //Capture Assessor Record    var QACurrentCount = AssRec.getFieldValue('custrecord_ass_qa_counter');      //Get Value of QA Count    var QAMax = AssRec.getFieldValue('custrecord_ass_rep_to_qa');        //Get Value of QA Max    var QANewCount = QACurrentCount+1;    var QAPercentage = (QANewCount/QAMax)*100;      alert(QACurrentCount);  alert(QANewCount);            alert(QAPercentage);     if (QAPercentage>0 && QAPercentage<=100)   {    AssRec.setFieldValue('custrecord_ass_qa_counter', QANewCount);         //Set Counter on Assessor Record to 2    nlapiSetFieldValue('custrecord_bsb_qa_required', 'T');            //Set QA required on original record to True   }   else if (QAPercentage=100)    AssRec.setFieldValue('custrecord_ass_qa_counter', 0);     var idorig = nlapiSubmitRecord(OrigRec,true);  var idass = nlapiSubmitRecord(AssRec,true);