<script type="text/javascript">
        function validateForm() {
            var a = document.forms["editorder"]["OrderID"].value;
            var b = document.forms["editorder"]["orderdate"].value;
            var c = document.forms["editorder"]["customer"].value;
            var d = document.forms["editorder"]["salesagent"].value;
            var e = document.forms["editorder"]["orderstatus"].value;
            if (a == null || a == "" || b == null || b == "" || c == null || c == "" || d == null || d == "" || e == null || e == ""){
                alert("One or more fields have been left blank.");
                return false;
            }
            if(isNaN(a)){
                alert("One or more inputs require numeric input where text was used.")
                return false;
            }
        }
    </script>