How to avoid double clicking of apex:commandButton?

Below  code can be used to avoid double clicking of apex:commandButton.

<apex:pageBlockButtons location="bottom">

<apex:actionStatus id="saveStatus">

<apex:facet name="stop">

<apex:commandButton value="Next Step" action="{!newCase}"

status="saveStatus" reRender="thefrm" />

</apex:facet>

<apex:facet name="start">

<apex:commandButton value="Saving" disabled="true" />

</apex:facet>

</apex:actionStatus>

</apex:pageBlockButtons>