CRm2011:Javascript for Alert and Required Fields

Javascript Sample:-

Only Change the Field name

//if the Credit Recommendation status is Review Completed then Credit Recommendation Status” must contain data, and the “Max Credit Approved Usage (MWh)” must contain data.
function oncreditreviewstatus() {
    if (Xrm.Page.getAttribute("lpc_credit_review_status").getValue() != null) {
        var currentVal = Xrm.Page.getAttribute("lpc_credit_review_status").getValue();
        if (currentVal != null && currentVal == 100000001) {
            if (Xrm.Page.getAttribute("lpc_credit_recommendation_status").getValue() == null || Xrm.Page.getAttribute("lpc_mwh_credit_approved_usage").getValue() == null)
            {
                alert("Please ensure the Credit Recommendation Status and Max Credit Approved Usage (MWh) are populated before completing your review");
                        Xrm.Page.getAttribute("lpc_credit_recommendation_status").setRequiredLevel("required");
                Xrm.Page.getAttribute("lpc_mwh_credit_approved_usage").setRequiredLevel("required");
            }
            else
            {
                Xrm.Page.getAttribute("lpc_credit_recommendation_status").setRequiredLevel("none");
                Xrm.Page.getAttribute("lpc_mwh_credit_approved_usage").setRequiredLevel("none");
            }
        }

    }
}