CRM 2011 Get attributes from an entity using JavaScript -

i trying fill read-only field automatically using java script web resource. field dependant on lookup containing custom entity , free text field of 4 characters (first part of postcode example: nw10)

i have written javascript values , create new value set in read-only field. when run string displayed shows "[object-object]-nw10".

i guess i'm asking how access attributes of type object passed function? javascript below:

function typeaffectedorregionaffected_onchanged(executioncontext, type, region, weighting) {  var type = xrm.page.data.entity.attributes.get(type).getvalue(); var region = xrm.page.data.entity.attributes.get(region).getvalue();  // if have values both fields if (type != null && region != null) {      // create weighting variable     var weighting = type.substring(4) + "-" + region;      // recreate weighting value     xrm.page.data.entity.attributes.get(weighting).setvalue(weighting); } } 

type lookup, need access name property

var weighting = type[0].name.substring(4) + "-" + region;