function WatermarkOnBlur(id, text) {
    var value = document.getElementById(id).value;    
    if (value == "") {
        document.getElementById(id).value = text;
    }
}

function WatermarkOnFocus(id, text) {    
    if (document.getElementById(id).value == text) {
        document.getElementById(id).value = "";
    }
}

function isNumberKey(evt) {
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;

    return true;
}