function getimgcode(param) {
    var getimagecode = document.getElementById("getcode");
    getimagecode.src = "common/pages/VerifyCode.aspx?param=" + param + "&s=" + Math.random();
}

function RequiredField(field, input) {
    if (input.value.length < 1) {
        ValidatorEnable(document.getElementById(field), false);
    }
}