function showhistory(dasepath)
{


if(window.XMLHttpRequest)
{ // Mozilla, Safari, ...
	http_request = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{ // IE
	http_request = new ActiveXObject("Microsoft.XMLHTTP");
}

var linkurl=dasepath;
http_request.open("GET",linkurl,false);
http_request.send(null);

//服务器端处理返回的是经过escape编码的字符串.
//在页面显示服务器查询结果

//var returntxt=unescape(http_request.responseText);
var returntxt=http_request.responseText;
//alert(http_request.responseText);

//通过XMLHTTP返回数据,开始构建Select.
document.write(returntxt);
}