function frmValidation() {
    var objFrm = window.document.forms["frmContactUsForm"];
    if (objFrm.txtFName.value == '') {
        alert("Please enter your name");
        objFrm.txtFName.focus();
        return false;
    }

    if (objFrm.txtAddress.value == '') {
        alert("Please enter your address");
        objFrm.txtAddress.focus();
        return false;
    }

    if (objFrm.txtEmail.value == '') {
        alert("Please enter your email address");
        objFrm.txtEmail.focus();
        return false;
    }
    window.location = 'ThankYou.htm';
}