How do you store request URL's in Javascript to satisfy the DRY principal?

NAMESPACE.categories.baseUri = '/categories';
NAMESPACE.categories.getUri = function(options)
{
  options = options || {};
  var uri = [NAMESPACE.categories.baseUri];

  if(options.id)
  {
    uri.push(options.id);
  }
  if(options.action)
  {
    uri.push(options.action);
  }
  if(options.format)
  {
    uri.push('?format=' + options.format);
  }

  return uri.join('/');
}

function ControlValuePair(Id, Value)
{
    this.Id = Id;
    this.Value = Value;
}

function CreateCollection(ClassName)
{
    var obj=new Array();
    eval("var t=new "+ClassName+"()");
    for(_item in t)
        {
            eval("obj."+_item+"=t."+_item);
        }
    return obj;
}

function ValuePairsCollection()
{
    this.Container="";
    this.Add=function(obj)
    {
        this.push(obj);
    }
}