var bgObj=document.createElement("div");//创建一个div对象（背景层）
var msgObj=document.createElement("div")//创建一个div对象（提示框层）
var http_request = false;
function sAlert(str){
  var msgw,msgh,bordercolor;
  msgw=650;//提示窗口的宽度
  msgh=200;//提示窗口的高度
  titleheight=25 //提示窗口标题高度
  bordercolor="#336699";//提示窗口的边框颜色
  //titlecolor="#99CCFF";//提示窗口的标题颜色

  var sWidth,sHeight;
  sWidth=document.body.offsetWidth;//浏览器工作区域内页面宽度
  sHeight=document.documentElement.scrollHeight;//screen.height;//屏幕高度（垂直分辨率）


  //背景层（大小与窗口有效区域相同，即当弹出对话框时，背景显示为放射状透明灰色）
  //定义div属性，即相当于
  //<div id="bgDiv" style="position:absolute; top:0; background-color:#777; filter:progid:DXImagesTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75); opacity:0.6; left:0; width:918px; height:768px; z-index:10000;"></div>
  bgObj.setAttribute('id','bgDiv');
  bgObj.style.position="absolute";
  bgObj.style.top="0";
  bgObj.style.background="#777";
  bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
  bgObj.style.opacity="0.6";
  bgObj.style.left="0";
  bgObj.style.width="100%";//sWidth + "px";
  bgObj.style.height=sHeight + "px";
  bgObj.style.zIndex = "10000";
  document.body.appendChild(bgObj);//在body内添加该div对象


  //定义div属性，即相当于
  //<div id="msgDiv" align="center" style="background-color:white; border:1px solid #336699; position:absolute; left:50%; top:50%; font:12px/1.6em Verdana,Geneva,Arial,Helvetica,sans-serif; margin-left:-225px; margin-top:npx; width:400px; height:100px; text-align:center; line-height:25px; z-index:100001;"></div>
  msgObj.setAttribute("id","msgDiv");
  msgObj.setAttribute("align","center");
  msgObj.style.background="white";
  msgObj.style.border="1px solid " + bordercolor;
  msgObj.style.position = "absolute";
  msgObj.style.left = "40%";
  msgObj.style.top = "40%";
  msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
  msgObj.style.marginLeft = "-225px" ;
  msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px";
  msgObj.style.width = msgw + "px";
  msgObj.style.height =msgh + "px";
  msgObj.style.textAlign = "center";
  msgObj.style.lineHeight ="25px";
  msgObj.style.zIndex = "10001";
 
  /*
  var title=document.createElement("h4");//创建一个h4对象（提示框标题栏）
  //定义h4的属性，即相当于
  //<h4 id="msgTitle" align="right" style="margin:0; padding:3px; background-color:#336699; filter:progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100); opacity:0.75; border:1px solid #336699; height:18px; font:12px Verdana,Geneva,Arial,Helvetica,sans-serif; color:white; cursor:pointer;" onclick="">关闭</h4>
  title.setAttribute("id","msgTitle");
  title.setAttribute("align","right");
  title.style.margin="0";
  title.style.padding="3px";
  title.style.background=bordercolor;
  title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
  title.style.opacity="0.75";
  title.style.border="1px solid " + bordercolor;
  title.style.height="18px";
  title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
  title.style.color="white";
  title.style.cursor="pointer";
  title.innerHTML="关闭";
  title.onclick=removeObj;


  var button=document.createElement("input");//创建一个input对象（提示框按钮）
  //定义input的属性，即相当于
  //<input type="button" align="center" style="width:100px; align:center; margin-left:250px; margin-bottom:10px;" value="关闭">
  button.setAttribute("type","button");
  button.setAttribute("value","关闭");
  button.style.width="60px";
  button.style.align="center";
  button.style.marginLeft="250px";
  button.style.marginBottom="10px";
  button.style.background=bordercolor;
  button.style.border="1px solid "+ bordercolor;
  button.style.color="white";
  button.onclick=removeObj;
 
  */
  document.body.appendChild(msgObj);//在body内添加提示框div对象msgObj
  //document.getElementById("msgDiv").appendChild(title);//在提示框div中添加标题栏对象title
 /*

  var txt=document.createElement("p");//创建一个p对象（提示框提示信息）
  //定义p的属性，即相当于
  //<p style="margin:1em 0;" id="msgTxt">测试效果</p>
  txt.style.margin="1em 0";
  txt.setAttribute("id","msgTxt");
  txt.innerHTML=str;//来源于函数调用时的参数值
  document.getElementById("msgDiv").appendChild(txt);//在提示框div中添加提示信息对象txt
  //document.getElementById("msgDiv").appendChild(button);//在提示框div中添加按钮对象button
  */
  document.getElementById("msgDiv").innerHTML="数据加载中,请稍候……";
  send_request(str);
}

function removeObj(){//点击标题栏触发的事件
	document.body.removeChild(bgObj);//删除背景层Div
	document.body.removeChild(msgObj);//删除提示框层
}
function send_request(ID) {//初始化、指定处理函数、发送请求的函数
        http_request = false;
	var  Digital=new  Date();
	Digital=Digital+40000;
	url="jfzs_style.aspx?action=msg&x="+Digital;
        //开始初始化XMLHttpRequest对象
        if(window.XMLHttpRequest) { //Mozilla 浏览器
                http_request = new XMLHttpRequest();
                if (http_request.overrideMimeType) {//设置MiME类别
                    http_request.overrideMimeType("text/xml");
                }
        }
        else if (window.ActiveXObject) { // IE浏览器
                try {
                    http_request = new ActiveXObject("Msxml2.XMLHTTP");
                } catch (e) {
                    try {
                        http_request = new ActiveXObject("Microsoft.XMLHTTP");
                    } catch (e) {}
                }
        }
        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;
        }
        
        //调用信息函数  
		http_request.onreadystatechange = processRequest;

        // 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("GET", url, true);
        http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
        http_request.setRequestHeader("Content-Type", "text/xml");
		http_request.setRequestHeader("charset", "utf-8");
        http_request.send(null);
}

// 处理返回信息的函数
function processRequest() {
    if (http_request.readyState == 4) { // 判断对象状态
        if (http_request.status == 200) { // 信息已经成功返回，开始处理信息
            //document.getElementById(currentPos).innerHTML="http_request.responseText";
            //document.getElementById(currentPos).innerHTML="成功添加到文件集'"+unescape(http_request.responseText)+"'";
            //alert(http_request.responseText);
			document.getElementById("msgDiv").innerHTML=http_request.responseText;
			var iwidth = 376;
			var iheight = 246; //定义允许高度，当宽度大于这个值时等比例缩小
			//suitPic(376,246)
        } else { //页面不正常
            alert("您所请求的页面有异常。");
			removeObj();
        }
    }
}

function suitPic(setWidth,setHeight) {
	try{
	var e = document.getElementById("mypic");
	srcWidth  = 300;//e.width;
	srcHeight = e.height;
	if(e.height / setHeight > e.width / setWidth && e.height / setHeight >0)
	{
		if (e.height > setHeight) {
		n = e.height / setHeight;
		e.height = setHeight;
		e.width = srcWidth / n;
		}
	}
	else if(e.width / setWidth > e.height / setHeight && e.width / setWidth>0 )
	{
		if (e.width > setWidth) {
			n = e.width / setWidth;
			e.width = setWidth;
			e.height = srcHeight / n;
		}
	}else
	{}
	}
	catch(e){
		suitPic(300,246);
	}
}