function getId(id){
	return document.getElementById(id);
}

function Box_detail(objID,W,H,inner,classname_re,title,isclose){
	var objHead,objBody,objFooter,inner,TitleImg,BoxCloseBtn,TitleTip;
	if(!getId(objID)){
	//创建html结构并赋id以及class		
		var obj = document.createElement("div");		
		var objHead = document.createElement("div");
		var objBody = document.createElement("div");
		
		obj.className=classname_re;	
		objHead.className=classname_re+"_Header";
		objBody.className=classname_re+"_Body";
		
		TitleImg=classname_re+"_TitleImg";	
		BoxCloseBtn=classname_re+"_BoxCloseBtn";	
		TitleTip=classname_re+"_TitleTip";
		
		if(isclose){
			BoxCloseBtn=classname_re+"_BoxCloseBtn_Cz";	
		}
		
		obj.id=objID;
		objHead.id=objID+"_head";
		objBody.id=objID+"_body";
		
		obj.appendChild(objHead);
		obj.appendChild(objBody);
		document.body.appendChild(obj);
		//如果参数为空时的处理
		if(W==期货||W<200||W==""){W=200}//最小宽度
		if(H==期货||H<60||H==""){H=60}
		var cancelBtn =objID+"cancel",closeBtn= objID+"closeBtn";
		
		objHead.innerHTML='<span class="'+TitleImg+'"></span><span class="'+TitleTip+'">'+title+'</span><span class="'+BoxCloseBtn+'" id='+closeBtn+'></span>';
		objBody.innerHTML=inner;
		
		//js样式设置
		getId(objHead.id).style.width=W+"px"
		getId(objBody.id).style.width=W+"px";
		getId(objBody.id).style.height=getId(objBody.id).clientHeight+"px";		
		obj.style.cssText+=";position:absolute;left:50%;top:50%;z-index:901; ";		
		obj.style.marginLeft=-obj.scrollWidth/2+"px";
		obj.style.marginTop=-obj.scrollHeight/3+"px";	
		
		document.body.style.cssText+="height:100%;overflow:auto;";	
			
		var mask=1;//是否创建遮罩层
		if(mask){
			var objMask = document.createElement("div");
				objMask.id="Mask";objMask.className="BoxMask_zz";
				document.body.appendChild(objMask);objMask.style.cssText+=";position:fixed;z-index:900;_position:absolute;_height:2720px;";
			}
			
		function Close(objID){
			document.body.removeChild(getId(objID));document.body.style.cssText+="width:100%;overflow:auto;"; if(objMask){document.body.removeChild(objMask)}
		}
		
		getId(closeBtn).onclick = function(){Close(objID)};//关闭按钮
		
		//拖动功能			
		var w = obj.scrollWidth,h = obj.scrollHeight;
		var iWidth = document.documentElement.clientWidth; 
		var iHeight = document.documentElement.clientHeight; 	
		var moveX = 0,moveY = 0,moveTop = 0,moveLeft = 0,moveable = false;
	
		objHead.onmousedown = function(e) {	
		moveable = false; 	
		e = window.event?window.event:e;
		moveX = e.clientX-obj.offsetLeft;		
		moveY = e.clientY-obj.offsetTop;
		obj.style.zIndex++;
		document.onmousemove = function(e) {
				if (moveable) {
				e = window.event?window.event:e;		
				var x = e.clientX - moveX;
				var y = e.clientY - moveY;
					if ( x > 0 &&( x + w < iWidth) && y > 0 && (y + h < iHeight) ) {
						obj.style.left = x + "px";
						obj.style.top = y + "px";
						obj.style.margin = "auto";
						}
					}
				}
				document.onmouseup = function () {moveable = false;};
		}
	}else(alert("弹层已经打开!"));
	
}