To clear all options from a select box you can use the next function.
Where select_id is the id of the select tag you want to clear.

function clearStatesOptions() {
	var oSelect = document.getElementById('select_id');
	for( i=oStates.options.length-1; i>=0; i--) {
		oSelect.remove(i);
	}
}

OR

function clearStatesOptions() {
	var oSelect = document.getElementById('select_id');
	while( oStates.options.length>0) {
		oSelect.remove(0);
	}
}

Edited 2 time(s). Last edit at 12/12/2006 07:48AM by panos.

Finaly found the safest way to do it (with out crashing IE)

function clearStatesOptions() {
	var oSelect = document.getElementById('select_id');
	for( i=oStates.options.length-1; i>=0; i--) {
		oSelect.options[i]=null;
	}
}