Get two values into one field javascriptr

Hi, I'm trying to get two lookup field and copy the content into one separate field. The following script works if i pick one one or the other but i cant see to get both value. I'm calling the javascript with OnSave.

function addparty() {

var consultant= Xrm.Page.getAttribute(net_requirednettitude).getValue();

var accountmanager = Xrm.Page.getAttribute(net_accountmanager).getValue();

Xrm.Page.getAttribute("requiredattendees").setValue(accountmanager + "" + consultant)

}