Invoking actions from javascript

Hi everyone,

                 I am trying to call an action through the below script:

 function CallActionFromJavaScript() {

   var projectName = "Project Created through Action from Javascript";
    var entityId = Xrm.Page.data.entity.getId();
    var entityName = "lead";
    var requestName = "new_LeadCreateProject";
    ExecuteActionCreateProject(projectName, entityId, entityName, requestName);}
function ExecuteActionCreateProject(projectName, entityId, entityName, requestName) {
    // Creating the request XML for calling the Action
    var requestXML = ""
    requestXML += "<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\">";
    requestXML += "  <s:Body>";
    requestXML += "    <Execute xmlns=\"http://schemas.microsoft.com/xrm/2011/Contracts/Services\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\">";
    requestXML += "      <request xmlns:a=\"http://schemas.microsoft.com/xrm/2011/Contracts\">";
    requestXML += "        <a:Parameters xmlns:b=\"http://schemas.datacontract.org/2004/07/System.Collections.Generic\">";
    requestXML += "          <a:KeyValuePairOfstringanyType>";
    requestXML += "            <b:key>Target</b:key>";
    requestXML += "            <b:value i:type=\"a:EntityReference\">";
    requestXML += "              <a:Id>" + entityId + "</a:Id>";
    requestXML += "              <a:LogicalName>" + entityName + "</a:LogicalName>";
    requestXML += "              <a:Name i:nil=\"true\" />";
    requestXML += "            </b:value>";
    requestXML += "          </a:KeyValuePairOfstringanyType>";
    requestXML += "          <a:KeyValuePairOfstringanyType>";
    requestXML += "            <b:key>ProjectName</b:key>";
    requestXML += "            <b:value i:type=\"c:string\" xmlns:c=\"http://www.w3.org/2001/XMLSchema\">" + project
Name + "</b:value>";
    requestXML += "          </a:KeyValuePairOfstringanyType>";
    requestXML += "        </a:Parameters>";
    requestXML += "        <a:RequestId i:nil=\"true\" />";
    requestXML += "        <a:RequestName>" + requestName + "</a:RequestName>";
    requestXML += "      </request>";
    requestXML += "    </Execute>";
    requestXML += "  </s:Body>";
    requestXML += "</s:Envelope>";
    var req = new XMLHttpRequest();
    req.open("POST", GetClientUrl(), false)
    req.setRequestHeader("Accept", "application/xml, text/xml, */*");
    req.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
    req.setRequestHeader("SOAPAction", "http://schemas.microsoft.com/xrm/2011/Contracts/Services/IOrganizationServic
/Execute");
    req.send(requestXML); 
    //Get the Resonse from the CRM Execute method
    //var response = req.responseXML.xml;
}
function GetClientUrl() {
    if (typeof Xrm.Page.context == "object") {
        clientUrl = Xrm.Page.context.getClientUrl();
    }
    var ServicePath = "/XRMServices/2011/Organization.svc/web";
    return clientUrl + ServicePath;

 }

I am calling this function on the onchange of industry field in lead.I need to create a project record through actions  where i am passing projectname as input parameter(string).But when changing industry it shows an error:

Field:industrycode

Event:onchange

Error:" CallActionFromJavaScript" is undefined

Please help.