Populating Appointment Fields from Regarding Opportunity

I'm trying to get the Campaign Lookup from the Opportunity to flow over to the appointment when it's created off the Opportunity. I have the following code and it populated the field with a campaign and no errors but it was a new campaing not the one from the Opportunity. So the code is close and looking for a brighter mind to say where my mistake is.

We are using Dynamics 4.0

Thanks

	// Populate Originating Campaign  ------------------------------------------------------------
	var serviceLocation = prependOrgName("/ISV/CRMServices/CrmRetrievalServiceIndustry.asmx");
	var soapXml='<?xml version="1.0" encoding="utf-8"?>';
	soapXml+='<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">';
	soapXml+='<soap:Body>';
	soapXml+='<retrieveRegardingObjectInfoOpportunity xmlns="http://tempuri.org/">';
	soapXml+='<regardingObjectGuid>'+crmForm.all.regardingobjectid.DataValue[0].id+'</regardingObjectGuid>';
	soapXml+='</retrieveRegardingObjectInfoOpportunity>';
	soapXml+='</soap:Body>';
	soapXml+='</soap:Envelope>';
	var xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
	xmlhttp.open("POST", serviceLocation, false);
	xmlhttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
	xmlhttp.setRequestHeader("Content-Length", soapXml.length);
	xmlhttp.setRequestHeader("SOAPAction", "http://tempuri.org/retrieveRegardingObjectInfoOpportunity");
	xmlhttp.send(soapXml);
	// Get Values from XML Doc
	var xmlDocumentYo = xmlhttp.responseXML;
	var custIDTags = xmlDocumentYo.getElementsByTagName("rsd_currentcampaignid");
	for (i=0; i < custIDTags.length; i++)
	{
	var currentcampaignGUID = xmlDocumentYo.getElementsByTagName("rsd_currentcampaignid")[i].childNodes[0].nodeValue;
	var currentcampaignName = xmlDocumentYo.getElementsByTagName("rsd_currentcampaignid")[i].getAttribute('name');
	}
	//Create an array to set as the DataValue for the lookup control. 
	var lookupDataPA = new Array(); 
	//Create an Object add to the array. 
	var lookupItemPA= new Object();
	lookupItemPA.id = currentcampaignGUID;
	lookupItemPA.typename = 'Campaign';
	lookupItemPA.name = currentcampaignName;
	// Add the object to the array. 
	lookupDataPA[0] = lookupItemPA; 
	crmForm.all.rsd_originatingcampaignid.DataValue = lookupDataPA;

	
	// Populate Originating Campaign END