How do I overcome a web login when the page defaults the password field to abcdefghijk ?

Hi Community,

I am trying to make a form fill login or a header injection to a website called Netsurion.

The web site does not support SAML OPENID OAUTH , so I will try header injection or form fill ...

However the webpage password field is default to: abcdefghijk 

<script type="text/javascript">
        function onPageLoad() {
            var urlValue = window.location.href;
            if (urlValue.indexOf('demoid') == -1 && urlValue.indexOf('usrid') == -1)
                loadInParent();

            if (document.getElementById("hdnBannerState").value == "1") {
                showPopup();
                document.getElementById("hdnBannerState").value = "0";
            }
            else {
                setFocusOnUserName();
            }

            if (document.getElementById("lgnControl_UserName") != null) {
                var usrName = document.getElementById("lgnControl_UserName").value;
                if (usrName.length > 0) {
                    if (document.getElementById("lgnControl_Password") != null) {
                        document.getElementById("lgnControl_Password").value = "abcdefghijk";
                    }
                }
            }

            $("#lgnControl_UserName").on("blur", function () {
                $("#imgLoading").show();
                var btnID = 'btnUpdate';
                __doPostBack(btnID, "");
            });
        }
    </script>

This overwrite my password....  so how do I overcome this problem ? 

Any ideas?

Thanks