Disable Submit button after user clicks it

[oneworld95]

How do you disable the Submit button after the user clicks it but re-enable it if validation errors occurred? Thanks.

[oneworld95]

Answering my own question :D

<a4j:commandbutton action="#{newemployee.sendEmail()}" value="Submit">
 onclick="this.disabled=true"
 oncomplete="#{facesContext.maximumSeverity == null ? '' : 'this.disabled=false'}"/></a4j:commandbutton>