ช่วยดู script ให้หน่อยคะ ie8 ไม่รองรับ..หาวิธีแก้ไม่ได้ เป็นมือใหม่หัดขับ script อ่ะคะ

<script language="javascript" type="text/javascript">
		
		var PersonID = "<%getPersonID%>"
		var BTH = document.getElementById('Branch')
		var url ='BranchDesc.aspx'
		var Branchs = document.getElementById('ddlBranchID')
		Branchs.onchange = Bonclick;
		window.onload = setDisplay;

	    var Asy = new Asychronous();
		function setDisplay(){
			BTH.style.display = 'block;			
			Bonclick()		
		}
		function Bonclick(){
			// Ajax Section
			var myRandom=parseInt(Math.random()*99999999);
			var p = "?mode=Create&PersonID=" + PersonID + "&BranchID=" + Branchs.options[Branchs.selectedIndex].value + "&rnd=" + myRandom
			var request = new HTTPRequest();
			if (request){
				request.open('GET',url+p,true)
				request.onreadystatechange = function(){
					if (request.readyState==4){
					ReadXMLDoc();
					}
				}
				request.send(null)
			}
			// Ajax Section 
		}

		function ReadXMLDoc(){
		
			var DocUrl = '../XMLDocument/Document_' + PersonID + '.xml'
			
			var req = new HTTPRequest();
			if (req){
				req.open('GET',DocUrl,true)
				req.onreadystatechange = function(){
				if (req.readyState==4){
						DocumentRender(req)
					}
				}
				req.send(null)
			}
		}
		function DocumentRender(req){
			var xmlhttp = new HTTPRequest();
			var myRandom=parseInt(Math.random()*99999999);
			var p = "?mode=Delete&PersonID=" + PersonID +  "&rnd=" + myRandom
			if (xmlhttp){
				xmlhttp.open('GET',url+p,true)
				xmlhttp.send(null)
			}
			if (req){
				var Doc = req.responseXML;
				
				document.getElementById('Name').innerHTML =getData(Doc,'Name')
				document.getElementById('PermitName').innerHTML = getData(Doc,'PermitName')
				document.getElementById('Address').innerHTML = getData(Doc,'Address')
			}
		}
		function getData(Doc,name){
			//return Doc.getElementsByTagName(name)[0].text
			var retName = "";
			if(Doc.getElementsByTagName(name)[0].childNodes[0] != "undefined"){
				retName= Doc.getElementsByTagName(name)[0].childNodes[0].nodeValue	
			}
			return retName;
		}
		</script>