Set the account lookup when new contact is created from the Contact lookup new button in Account form in MS CRM 4.0

function getAccountLookup()
{
try
{
var stringXml = window.opener.document.getElementById("fetchxml").value;

xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async="false";
xmlDoc.loadXML(stringXml)

var name = xmlDoc.selectNodes('fetch/entity/filter/condition')[1].attributes[2].value;
var id = xmlDoc.selectNodes('fetch/entity/filter/condition')[1].attributes[4].value;

//Create an array to set as the DataValue for the lookup control.
var lookupData = new Array();

//Create an Object add to the array.
var lookupItem= new Object();

//Set the id, typename, and name properties to the object.
lookupItem.id = id;
lookupItem.typename = 'account';
lookupItem.name = name;

// Add the object to the array.
lookupData[0] = lookupItem;

// Set the value of the lookup field to the value of the array.
crmForm.all.parentcustomerid.DataValue = lookupData;

}
catch (e)
{}
}