Hi,
I think the subject says everything. Here is my code:
<h:form id="projectForm"> <a:commandButton id="proUpdateButton" reRender="panel1" styleClass="button" action="#{projektManager.updateProjekt()}" value="Save changes"/> <h:inputText onchange="javascript:document.getElementById('projectForm:proUpdateButton').style.backgroundColor=red;" required="true" value="#{projekt.projektnummer}" maxlength="10" size="30"/> .... </h:form>
<form id="j_id102:projectForm" ...> <input id="j_id102:projectForm:proUpdateButton" ...> ...