<a4j:commandButton image="#{msgs[\'button.edit\']}" alt="#{msgs[\'button.edit.alt\']}"
type="button"
rendered="#{backing_bean_managechemspecdetails.m_bShowEditButton}" >
<a4j:support event="onclick" action="#{backing_bean_managechemspecdetails.editInstruction}" onsubmit="return radioCheck()"
reRender="manageinstructiontable,table5,table6" >
</a4j:support>
</a4j:commandButton>
but on click of this button the page refreshes.