var formName = "aspnetForm";

function validate() {
    var txtLoginId = getFormField(formName, _controlPrefix_id + "txtLoginId");
    var drpPlans = getFormField(formName, _controlPrefix_id + "drpPlans"); 
    if (txtLoginId != null) {
        if (stringNullOrEmpty(txtLoginId.value)) {
            txtLoginId.focus();
            handleErrorMessage(loginIdError);
            return false;
        }
        if(drpPlans != null && drpPlans.length > 0) {
            var idx = drpPlans.selectedIndex;
            if (drpPlans.options[idx].text == "") {
                drpPlans.focus();
                handleErrorMessage(planError);
                return false;
            }
        }
        setTimeout('DelayDisable()', 10);
    }
    return true;
}

function DelayDisable() {
    getFormField(formName, _controlPrefix_id + "btnContinue").disabled = true;
}