มีปัญหาการใช้งาน Tab Menu Javascript ไม่สามารถรันที่ Chrome หรือ Firefox ได้ค่ะ รบกวนผู้รู้ช่วยแนะนำด้วยค่ะ

function doSelect(index) 
{
	document.getElementById('MultiPage1').setAttribute('selectedIndex', index);

	clearCurrentFocus('navigation');

	document.getElementById('li_' + index).id = 'currentitem'; 
	
	var eA = document.getElementById('a_' + index)

	eA.id = 'currentlink'; 
	eA.setAttribute('class', 'activelink'); 
	
	return false;
}

function clearCurrentFocus(tabId) 
{
	var eDiv = document.getElementById(tabId);
	if ( null == eDiv || undefined == eDiv ) return false;
	
	var eUl = eDiv.getElementsByTagName('ul');
	if ( null == eUl || undefined == eUl ) return false;
	
	var eLis = eUl[0].getElementsByTagName('li');
	if ( null == eLis || undefined == eLis ) return false;

	var i;
	for(i=0;i<eLis.length;i++)
	{
		eLis[i].id = "li_" + i;
		
		var eA = eLis[i].getElementsByTagName('a');
		if ( null != eA && undefined != eA ) 
		{
			eA[0].id = 'a_' + i; 
			eA[0].setAttribute('class', ''); 
		}
	}

	return false;
}

                               <div class="container" id="navigation">
					<ul id="navlist">
									<li id="currentitem" onclick="return doSelect(0)">
										<A class="activelink" id="currentlink" href="#">
											<asp:Label id="lblProduct" runat="server">Tab1</asp:Label></A>
									<li id="li_1" onclick="return doSelect(1)">
										<A id="a_1" href="#">
											<asp:Label id="lblProcess" runat="server">Tab2</asp:Label></A>
									<li id="li_2" onclick="return doSelect(2)">
										<A id="a_2" href="#">
											<asp:Label id="lblmachine" runat="server">Tab3</asp:Label></A> 
										 
									</li>
								</ul>
				</div>

 
<iewc:multipage id="MultiPage1" runat="server">
					<iewc:pageview>
						<table class='ssSpecification_Table'>
							<tr>
								<td>
									test_Tab1
								</td>
							</tr>
						</table>
					</iewc:pageview>
					<iewc:pageview>
						<table class='ssAdditional_Table'>
							<tr>
								<td>
									test_Tab2
								</td>
							</tr>
						</table>
					</iewc:pageview>
					 
						</table>
					</iewc:pageview>
</iewc:multipage>