objSelect.add(objOption, null) is not supported by MSIE 6, is not supported by MSIE 7 and is not supported by MSIE 8 beta 1

Create and populate a select with the add method

References:
DOM 1 HTML, Interface HTMLSelectElement on the add method and
DOM 2 HTML, Interface HTMLSelectElement on the add method says:
void add(in HTMLElement element, in HTMLElement before)
"Add a new element to the collection of OPTION elements for this SELECT. This method is the equivalent of the appendChild method of the Node interface if the before parameter is null. It is equivalent to the insertBefore method on the parent of before in all other cases. (...)

before of type HTMLElement:
      The element to insert before, or null for the tail of the list."

Firefox 1.5, Firefox 2, Firefox 3, Opera 9.27, Opera 9.50, Safari 3.1, Konqueror 3.5.8, Seamonkey 1.x Seamonkey 2.x, NS 7.0, NS 7.2, K-meleon 1.x, Galeon 2.0.4, Epiphany 2.22 all pass this test.