function fillXmlCombo( combo, xml ) {
	items = xml.getElementsByTagName( 'option' );

	for( i=0; i<items.length; i++ ) {
		nombre = items[i].getElementsByTagName( 'text' )[0].firstChild.nodeValue;
		valor = items[i].getElementsByTagName( 'value' )[0].firstChild.nodeValue
		selected = ( items[i].getElementsByTagName( 'selected' )[0] != null );
		combo.options[combo.options.length] = new Option( nombre, valor );
		if( selected ) combo.options[combo.options.length - 1].selected = true;
	}
}