Form level error Notification and Hide BPF PreviousStage / SetActive Button in ms crm

Form Notification error

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function showNotificationOnFields() 

{

Xrm.Page.getControl("custm_importancetocustomer").setNotification("Any message")

}

Hide Previous Stage Button in BPF

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function hidePreviousStageButton(){ 

var hide = true;

var interval = null;

    interval = setInterval(function () {

        var element = parent.document.getElementById("stageBackActionContainer");

        if (element != null && hide == true) {

            hide = false;

            element.style.display = "none";

            clearInterval(interval);

        }

    }, 1000);

}

Hide SetActive Button in BPF

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function HideSetActiveButton(){ 

var hide = true;

var interval = null;

    interval = setInterval(function () {

        var element = parent.document.getElementById("stageSetActiveActionContainer");

        if (element != null && hide == true) {

            hide = false;

            element.style.display = "none";

            clearInterval(interval);

        }

    }, 1000);

}