// 切换界面
function doClick_down(o){
var id;
var j;
var e;
	for (var i=1; i<=3; i++)
	{
		//取得导航栏里id里的值，如id = "d_1"
		id ="a"+i;
		//取得导航栏里id的属性，如"id" = d_1
		j = document.getElementById(id);
		//取得内容栏里的id的值，如id = "c_1"
		e = document.getElementById("c_"+i);
		if(id == o.id) {
			j.className="a102";
			e.style.display = "block";
		}
		else{
			j.className="a101";
			e.style.display = "none";
		}
	}
}

function CreateAjax()
{
	var AJAXML = false;
	try
	{
		AJAXML = new XMLHttpRequest();
	}
	catch (e)
	{
		try
		{
			AJAXML = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try
			{
				AJAXML = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e)
			{
				AJAXML = false;
			}
		}
	}
	return AJAXML;
}

// 首页滚动公告
function startmarquee(height, speed, timeout){
var stopscroll = false;

var demo = document.getElementById("demo");
with(demo){
    style.height = height; 
　 style.overflow = 'hidden'; 
    noWrap = true; 
}
demo.onmouseover = new Function('stopscroll = true');
demo.onmouseout  = new Function('stopscroll = false');

var preTop = 0;
var currentTop = 0;
var stoptime   = 0;
var demo2 = document.getElementById("demo1");
demo.appendChild(demo2.cloneNode(true));

init_srolltext();

function init_srolltext(){
  demo.scrollTop = 0;
  setInterval(mouse, speed);
}

function mouse(){
if(stopscroll == true) return;
currentTop += 1;
// 停止状态
if(currentTop == height+1){
    stoptime += 1;
    currentTop -= 1;
    if(stoptime == timeout){
	    currentTop = 0;
	    stoptime = 0;
    }
// 滚动状态 
}else{
    preTop = demo.scrollTop;
    demo.scrollTop += 1;
    if(preTop == demo.scrollTop){
        demo.scrollTop = 0;
	    demo.scrollTop += 1;
    }
}
}
}