JavaScript类型装换

function checkcount(obj)
         {
         obj.value = to2bits(obj.value);//把当前金额转换成两位小数金额
         var newvalue = obj.value;
         var newid = obj.id;
            
             var strF = newid.split('_')[0];
             var strS = newid.split('_')[1];
             var strCom = strF+"_"+strS+"_";
             var strtxtShpAmt = strCom +"lbShpAmt";//出货金额
             var strtxtAcrAmt = strCom + "lbAcrAmt";//已收款金额
             var strtxAmt = strCom + "txtAmt";//本次收款金额
            
             var txtShpAmt = document.getElementById(strtxtShpAmt);
             var txtAcrAmt = document.getElementById(strtxtAcrAmt);
             var txAmt = document.getElementById(strtxAmt);
            
             var CheckMoney = parseFloat(txtShpAmt.innerHTML)-parseFloat(txtAcrAmt.innerHTML)-newvalue;
             var playMoney=parseFloat(txtShpAmt.innerHTML)-parseFloat(txtAcrAmt.innerHTML);
            
                    if(CheckMoney < 0)
                         {
                              alert("当前金额超出应收款金额："+playMoney);
                              obj.value = "0.00";
                          }              
       }
当金额为12,006.00  时也就是有个逗号时parseFloat(txtShpAmt.innerHTML)就会为12，该如何改啊
求救啊