Richface Sort Issue with IE 8

[antodomnic]

Hi,

We have the below code which works very fine with IE 6 / FF , however gives the below  with IE 8.

Message: Object doesn't support this property or method

Line: 83

Char: 390

Code: 0

Version RF : 3.1.5GA

Ajax : 4.

Code:

====

<rich:column sortBy="#{transId}" sortable="true" sortOrder="ASCENDING" render="Data">

<f:facet name="header">

<h:outputText value="trans ID" />

</f:facet>

<a4j:commandLink id="transLnk"

   value="#{Data.stat.transId}"

action="#{searBean.Navi}">

<f:param id="CltransId" name="clickedTransId"

value="#{SummaryData.stat.transId}" />

</a4j:commandLink>

</rich:column>

============

Any advise would be greatly appreciated. Thanks!