[Ie&firefox compatible] JS to select operation _ form Effects

Today in the Ajax use of two Drop-down boxes dynamically add options in the Select, when I am in the normal use of IE test in Firefox is not normal use, I am not very familiar with the script, so the Internet check to find them in the dynamic add option when a little different.

Take him down below, and you might use it later:

To delete all options in a select dynamically:
function Deletealloptions (SEL) {
sel.options.length=0;
}

To delete an option in a select dynamically:
function Deleteoption (sel,indx) {
Sel.options.remove (INDX);
}

Dynamically add items in Select option:
function AddOption (sel,text,value) {
Sel.options.add (New Option (Text,value));
}

Above in IE and Firefox can test success, I hope you can use it later.
In fact, with the standard DOM operation is also possible, that is, document.createelement,appendchild,removechild and so on. :)