var http_request = false;
function send_request(url,data) {
	if (window.XMLHttpRequest) {
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {//设置MiME类别
		http_request.overrideMimeType('text/xml');
		}
	}
	else if (window.ActiveXObject) {
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {
				http_request = false;
			}
		}
	}
	if (!http_request) { //异常，创建对象实例失败
		window.alert("不能创建XMLHttpRequest对象实例.");
		return false;
	}
	//指定响应处理函数
	http_request.onreadystatechange = chkLogin;
	// 确定发送请求的方式和URL以及是否同步执行下段代码
	http_request.open("POST", url, true);
	http_request.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	http_request.send(data)
}

function getObj(para)
{
	if (!document.getElementById(para))
	{
		if (!document.getElementsByName(para)[0])
		{
			if (!document.getElementsByTagName(para)[0])
			{
				return false;
			}
			else
			{
				return document.getElementsByTagName(para)[0];
			}
		}
		else
		{
			return document.getElementsByName(para)[0];
		}
	}
	else
	{
		return document.getElementById(para);
	}
}

function String.prototype.trim() {return this.replace(/(^\s*)|(\s*$)/g,"");}