js报错

<script type="text/javascript" language="javascript">
function dosubmit(){
    var CUSTOMER_STORE_ID=document.getElementById("CUSTOMER_STORE_ID");
    if(CUSTOMER_STORE_ID=null||CUSTOMER_STORE_ID=""){
      alert("请输入值");
      //alert(CUSTOMER_STORE_ID);
    }else{
      // alert("提交");
       document.form2.submit();
    }
}
</script>