function addOption(select, value, text)
{
	var node = document.createElement('option');
	node.setAttribute('value', value);
	node.innerHTML = text;
	select.appendChild(node);
}

function removeAllOptions(select)
{
	var len = select.childNodes.length;
	for (var i=len-1; i>0; i--)
		select.removeChild(select.childNodes[i]);
}