h:commandButton action is not triggered in ie8

[Need Help]

Hello All,
we are using the below tags. Everything works fine in ie6 but not in ie8... action is not getting triggered...I could not see any script issue also in the developer tool...
Somebody please guide me on this...

<f:view>
		<h:form id="personMaintPage" name="personMaintPage">
  <h:commandButton id="findBtn" action="#{person.find}" style="display:none"/> 
							<button id="find" class='btn' type ='submit' onclick="emtyFunction('find');">Fin<span class="HotKey">d</span></button>
							<rich:hotKey id="findKey" key="ctrl+d" handler="emtyFunction('find');" />
</h:form>
</f:view>

<script>
	function emtyFunction(flag){
	    
	    if(flag =='find'){

document.getElementById('personMaintPage:findBtn').click();
			
		}	    
	}
</script>