Retrieve roles of loggedin user in Jscript

var roleName="SalesRep";


var isSalesrep = UserHasRole(roleName);





function UserHasRole(roleName)
{
var oXml = GetCurrentUserRoles();
                     var found = false;
                     if(oXml != null)
{
var roles = oXml.selectNodes("//BusinessEntity/q1:name");
if(roles != null)
{

for( i = 0; i < roles.length; i++)
{
if(roles[i].text == roleName)
{
found = true;
return found;
}
}

}
}
return found;
}
function GetCurrentUserRoles()
{
var xml = "" + 


"<?xml version=\"1.0\" encoding=\"utf-8\"?>" + 


"<soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">" + 


GenerateAuthenticationHeader() + 


" <soap:Body>" + 


" <RetrieveMultiple xmlns=\"http://schemas.microsoft.com/crm/2007/WebServices\">" + 


" <query xmlns:q1=\"http://schemas.microsoft.com/crm/2006/Query\" xsi:type=\"q1:QueryExpression\">" + 


" <q1:EntityName>role</q1:EntityName>" + 


" <q1:ColumnSet xsi:type=\"q1:ColumnSet\">" + 


" <q1:Attributes>" + 


" <q1:Attribute>name</q1:Attribute>" + 


" </q1:Attributes>" + 


" </q1:ColumnSet>" + 


" <q1:Distinct>false</q1:Distinct>" + 


" <q1:LinkEntities>" + 


" <q1:LinkEntity>" + 


" <q1:LinkFromAttributeName>roleid</q1:LinkFromAttributeName>" + 


" <q1:LinkFromEntityName>role</q1:LinkFromEntityName>" + 


" <q1:LinkToEntityName>systemuserroles</q1:LinkToEntityName>" + 


" <q1:LinkToAttributeName>roleid</q1:LinkToAttributeName>" + 


" <q1:JoinOperator>Inner</q1:JoinOperator>" + 


" <q1:LinkEntities>" + 


" <q1:LinkEntity>" + 


" <q1:LinkFromAttributeName>systemuserid</q1:LinkFromAttributeName>" + 


" <q1:LinkFromEntityName>systemuserroles</q1:LinkFromEntityName>" + 


" <q1:LinkToEntityName>systemuser</q1:LinkToEntityName>" + 


" <q1:LinkToAttributeName>systemuserid</q1:LinkToAttributeName>" + 


" <q1:JoinOperator>Inner</q1:JoinOperator>" + 


" <q1:LinkCriteria>" + 


" <q1:FilterOperator>And</q1:FilterOperator>" + 


" <q1:Conditions>" + 


" <q1:Condition>" + 


" <q1:AttributeName>systemuserid</q1:AttributeName>" + 


" <q1:Operator>EqualUserId</q1:Operator>" + 


" </q1:Condition>" + 


" </q1:Conditions>" + 


" </q1:LinkCriteria>" + 


" </q1:LinkEntity>" + 


" </q1:LinkEntities>" + 


" </q1:LinkEntity>" + 


" </q1:LinkEntities>" + 


" </query>" + 


" </RetrieveMultiple>" + 


" </soap:Body>" + 


"</soap:Envelope>" + 


"";
var xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
xmlHttpRequest.Open("POST", "/mscrmservices/2007/CrmService.asmx", false);
xmlHttpRequest.setRequestHeader("SOAPAction"," http://schemas.microsoft.com/crm/2007/WebServices/RetrieveMultiple");
xmlHttpRequest.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
xmlHttpRequest.setRequestHeader("Content-Length", xml.length);
xmlHttpRequest.send(xml);
var resultXml = xmlHttpRequest.responseXML;
                     return(resultXml);
}