var d = document;
var w = window;
var _d = document;
var _w = window;

function ajax_init(is_xml)
{
	var req = false;
	if (w.XMLHttpRequest) {
		req = new XMLHttpRequest();
		if (req.overrideMimeType) {
			if( is_xml ) { req.overrideMimeType("application/xml"); }
			else { req.overrideMimeType("text/plain"); }
		}
	} else if (w.ActiveXObject) {
		try { req = new w.ActiveXObject("MSXML3.XMLHTTP"); } catch(exptn) {
		try { req = new w.ActiveXObject("MSXML2.XMLHTTP.3.0"); } catch(exptn) {
		try { req = new w.ActiveXObject("Msxml2.XMLHTTP"); } catch(exptn) {
		try { req = new w.ActiveXObject("Microsoft.XMLHTTP"); } catch(exptn) {
		}}}}
	}
	return req;
}

function trim(str)
{
	if( typeof(str) != "string" ) {
		return str;
	}
	str	= str.replace(/^\s+/, "");
	str	= str.replace(/\s+$/, "");
	return str;
}

function ltrim(str)
{
	if( typeof(str) != "string" ) {
		return str;
	}
	str	= str.replace(/^\s+/, "");
	return str;
}