var contents = $('left_contents');
	var set_val = "contents="+encodeURIComponent(contents.innerHTML);
	new Ajax.Request("/word_tip.php",{
	method:'post',
	parameters: set_val,
	asynchronous:true,
	onSuccess:get_res,
	onFailure:error});

	function get_res(req){
		$("left_contents").innerHTML = "";
		xml = req.responseXML;
		res = xml.getElementsByTagName("content")[0].firstChild.nodeValue;
		$("left_contents").innerHTML += res;
	}

	function error(req){
		$('left_contents').innerHTML = contents.innerHTML;
	}