//弹出层
function openLayer(objId,bgimg) {
	var arrayPageSize = getPageSize();//调用getPageSize()函数
	var arrayPageScroll = getPageScroll();//调用getPageScroll()函数
	if (!document.getElementById("popupAddr")) {
//创建弹出内容层
		var popupDiv = document.createElement("div");
//给这个元素设置属性与样式
		popupDiv.setAttribute("id", "popupAddr");
		popupDiv.style.position = "absolute";
		popupDiv.style.border = "1px solid #ccc";
		popupDiv.style.zIndex = 99;
		popupDiv.style.background = "#ddf";
//创建弹出背景层
		var bodyBack = document.createElement("div");
		bodyBack.setAttribute("id", "bodybg");
		bodyBack.style.position = "absolute";
		bodyBack.style.width = "100%";
		bodyBack.style.height = (arrayPageSize[1] + 35 + "px");
		bodyBack.style.zIndex = 98;
		bodyBack.style.top = 0;
		bodyBack.style.left = 0;
		bodyBack.style.filter = "alpha(opacity=65)";
		bodyBack.style.opacity = 0.5;
		bodyBack.style.background = "#000";
//实现弹出(插入到目标元素之后)
		var mybody = document.getElementById(objId);
		insertAfter(popupDiv, mybody);//执行函数insertAfter()
		insertAfter(bodyBack, mybody);//执行函数insertAfter()
	}
//显示背景层
	document.getElementById("bodybg").style.display = "";
//显示内容层
	var popObj = document.getElementById("popupAddr");
	popObj.innerHTML = "<div id='x_title' onMousedown='StartDrag(this)' onMouseup='StopDrag(this)' onMousemove='Drag(this)'></div>" + "<iframe id='x_content' frameborder=0 scrolling=auto ></iframe>";
//document.getElementById(objId).innerHTML;
	popObj.style.display = "";
//让弹出层在页面中垂直左右居中(统一)
// popObj.style.width  = "600px";
// popObj.style.height = "400px";
// popObj.style.top  = arrayPageScroll[1] + (arrayPageSize[3] - 35 - 400) / 2 + 'px';
// popObj.style.left = (arrayPageSize[0] - 20 - 600) / 2 + 'px';
//让弹出层在页面中垂直左右居中(个性)
	var arrayConSize = getConSize(objId);
	popObj.style.top = arrayPageScroll[1] + (arrayPageSize[3] - arrayConSize[1]) / 2 - 100 + "px";
	popObj.style.left = (arrayPageSize[0] - arrayConSize[0]) / 2 - 100 + "px";
}
//获取内容层内容原始尺寸
function getConSize(conId) {
	var conObj = document.getElementById(conId);
	conObj.style.position = "absolute";
	conObj.style.left = -1000 + "px";
	conObj.style.display = "";
	var arrayConSize = [conObj.offsetWidth, conObj.offsetHeight];
	conObj.style.display = "none";
	return arrayConSize;
}
function insertAfter(newElement, targetElement) {//插入
	var parent = targetElement.parentNode;
	if (parent.lastChild == targetElement) {
		parent.appendChild(newElement);
	} else {
		parent.insertBefore(newElement, targetElement.nextSibling);
	}
}
//获取滚动条的高度
function getPageScroll() {
	var yScroll;
	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else {
		if (document.documentElement && document.documentElement.scrollTop) {
			yScroll = document.documentElement.scrollTop;
		} else {
			if (document.body) {
				yScroll = document.body.scrollTop;
			}
		}
	}
	arrayPageScroll = new Array("", yScroll);
	return arrayPageScroll;
}
//获取页面实际大小
function getPageSize() {
	var xScroll, yScroll;
	if (window.innerHeight && window.scrollMaxY) {
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else {
		if (document.body.scrollHeight > document.body.offsetHeight) {
			sScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else {
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
	}
	var windowWidth, windowHeight;
//var pageHeight,pageWidth;
	if (self.innerHeight) {
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else {
		if (document.documentElement && document.documentElement.clientHeight) {
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else {
			if (document.body) {
				windowWidth = document.body.clientWidth;
				windowHeight = document.body.clientHeight;
			}
		}
	}
	var pageWidth, pageHeight;
	if (yScroll < windowHeight) {
		pageHeight = windowHeight;
	} else {
		pageHeight = yScroll;
	}
	if (xScroll < windowWidth) {
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}
	arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);
	return arrayPageSize;
}
//关闭弹出层
function closeLayer() {
//document.getElementById("popupAddr").style.display = "none";
//document.getElementById("bodybg").style.display = "none";
    var x_win= document.getElementById("x_win");
    var popupAddr=document.getElementById("popupAddr");
    var bodybg=document.getElementById("bodybg");
	document.getElementById("x_win").parentNode.removeChild(x_win);
	document.getElementById("popupAddr").parentNode.removeChild(popupAddr);
	document.getElementById("bodybg").parentNode.removeChild(bodybg);
	return false;
}
//拖拽
//对“拖动点”定义：onMousedown="StartDrag(this)" onMouseup="StopDrag(this)" onMousemove="Drag(this)"即可
var move = false, oldcolor, _X, _Y;
function StartDrag(obj) {  //定义准备拖拽的函数
	obj.setCapture(); //对当前对象的鼠标动作进行跟踪
	//oldcolor = obj.style.backgroundColor;
	//obj.style.background = "#999";
	move = true;
//获取鼠标相对内容层坐标
	var parentwin = document.getElementById("popupAddr");
	_X = parentwin.offsetLeft - event.clientX;
	_Y = parentwin.offsetTop - event.clientY;
}
function Drag(obj) {        //定义拖拽函数
	if (move) {
		var parentwin = document.getElementById("popupAddr");
		parentwin.style.left = event.clientX + _X;
		parentwin.style.top = event.clientY + _Y;
	}
}
function StopDrag(obj) {   //定义停止拖拽函数
	//obj.style.background = oldcolor;
	obj.releaseCapture(); //停止对当前对象的鼠标跟踪
	move = false;
}
function alertWin(URL, title, width, height, imgsrc, bgimg) {
	var obj = document.createElement("div");
	obj.setAttribute("id", "x_win");
	obj.style.position = "absolute";
	document.body.appendChild(obj);
	openLayer("x_win",bgimg);
	if (width != null) {
		document.getElementById("x_win").width = width + "px";
		document.getElementById("x_title").width = width + "px";
	}
	var titlestr = "<table id='x_table'><tr><td width='8%'><div id='x_img'/></td><td id='x_titlename' width='55%'></td><td id='x_button' width='40%' align='right'></td></tr></table>";
	document.getElementById("x_title").innerHTML = titlestr;
	document.getElementById("x_table").width = width + "px";
	if (imgsrc != null) {
		//document.getElementById("x_img").src = imgsrc;
	}
	if (title != null) {
		document.getElementById("x_titlename").innerHTML = title;
	}
	document.getElementById("x_button").innerHTML = "<div id='x_closebt'  onclick='closeLayer()'/>";
	if (width != null) {
		document.getElementById("x_content").width = width;
	}
	if (height != null) {
		document.getElementById("x_content").height = height;
	}
	document.getElementById("x_content").src = URL;
}
function moveCenter(top1)//移动到屏幕正中,top1为微调
{
var x_win=document.getElementById("popupAddr");
x_win.style.left=document.body.scrollLeft+(document.body.clientWidth-x_win.offsetWidth)/2;
if(top1!=null)
x_win.style.top=parseInt(x_win.style.top)-top1;
}