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At FireFox you can use

selectTag.innerHTML = textLoadedWithXHR

to populate a select input. Intenet Explorer doesn't support that feature! It's a bug as you can see in the Microsoft KB.

I used JSON support and Dojo to populate an existing select input with new options.

Check out the following Javascript code:

var sel = document.getElementById("selectTag");
//delete old entries
while (sel.length > 0)
sel.options[sel.length-1] = null;

for (var key in json)
{
var value = json[key];

var opt = new Option(value, key);

sel.options[sel.length] = opt;
}