var randomImg={};
//获得随机图片
randomImg.getImg = function()
{
	var xmlHttp;
	try
	{
		xmlHttp = new XMLHttpRequest();
	}
	catch (e)
	{
		try
		{
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try
			{
				xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e)
			{
				alert("您的浏览器不支持AJAX！");
				return false;
			}
		}
	}
	xmlHttp.onreadystatechange = function()
	{
		if (xmlHttp.readyState == 4)
		{
			document.getElementById('img1').src = xmlHttp.responseText;
			document.getElementById('img1').width = '50';
		}
	}
	var url = '/ui/helper/getCI.jsp?time=' + new Date();
	xmlHttp.open('GET', url, true);
	xmlHttp.send(null);
}