function vote_request(item_id) {
	item_id_global = item_id;
	url = "vote_item.php?item_id=" + item_id;
	request = createXMLHttpRequest();
	if(request){
		request.onreadystatechange = check;
		request.open("get", url, true);
		request.send();
	}
}


function check(){
	if(request.readyState == 4 && request.status == 200) {
		if(request.responseText == "1") {
			var item = document.getElementById(String(item_id_global));
			span = item.getElementsByTagName('span');
			//投票数+1
			span[0].innerHTML = parseInt(span[0].innerHTML) + 1;
			
			//投票ボタンを無効に
			div = item.getElementsByTagName('div');
			for(i = 0; i < div.length; i++) {
				if(div[i].className == 'txt-style01 vote_button'){
					div[i].innerHTML = '<span class="color-grey">投票済み</span>';
					break;
				}
			}
		}
	}
}

function createXMLHttpRequest() {
	var XMLhttpObject = null;
	try{
		XMLhttpObject = new XMLHttpRequest();
	}catch(e){
		try{
			XMLhttpObject = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(e){
			try{
				XMLhttpObject = new ActiveXObject("Microsoft.XMLHTTP");
			}catch(e){
				return null;
			}
		}
	}
	return XMLhttpObject;
}