function sAlert(str){ 
		var msgw,msgh,bordercolor;
		msgw=600;//提示窗口的宽度 
		msgh=550;//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 

//↓-------------------------------------------------------
		//以下是在窗口上面铺一个背景色#777透明度为25%的id="bgDiv"的层
		var sWidth,sHeight;
		sWidth=document.body.offsetWidth;
		sHeight=screen.height+100;
		var bgObj=document.createElement("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=sWidth + "px";
		bgObj.style.height=sHeight + "px";
		bgObj.style.zIndex = "10000";
		document.body.appendChild(bgObj);
//↑-------------------------------------------------------

//↓-------------------------------------------------------
		//以下是创建一个新弹出的窗口
		var msgObj=document.createElement("div") 
		msgObj.setAttribute("id","msgDiv");
		msgObj.setAttribute("align","center");
		msgObj.style.background="url(images/pop_b.gif)";
		msgObj.style.border="0px solid " + bordercolor;
		msgObj.style.position = "absolute";
		msgObj.style.left = "300px";//弹出的窗口距离左边的位置
		msgObj.style.top = "60px";//弹出的窗口距离上边的位置
		msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
		msgObj.style.marginLeft = "-225px";
		msgObj.style.width = msgw + "px";
		msgObj.style.height ="550px";
		msgObj.style.textAlign = "left";
		msgObj.style.lineHeight ="25px";
		msgObj.style.zIndex = "10001";
		
		var title=document.createElement("h4");
		title.setAttribute("id","msgTitle");
		title.setAttribute("align","left");
		title.style.margin="0";
		title.style.padding="10px 0 0 15px";
		title.style.background="url(images/pop_t.gif)";
		title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=100, startY=100, finishX=0, finishY=0,style=1,opacity=75,finishOpacity=100);";
		title.style.opacity="0.75";
		title.style.border="0px solid " + bordercolor;
		title.style.height="32px";
		title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
		title.style.color="#333";
		title.style.cursor="pointer";
		title.innerHTML="<b>NEC System Technologies( Hangzhou ),Ltd.</b>";
		title.onclick=function(){ 
				document.body.removeChild(bgObj);
				document.getElementById("msgDiv").removeChild(title);
				document.body.removeChild(msgObj);
			}
		document.body.appendChild(msgObj);
		document.getElementById("msgDiv").appendChild(title);
		var txt=document.createElement("p");
		txt.style.margin="1em auto";
		txt.style.width = "550px";
		txt.style.height ="450px";
		txt.style.overflow="auto";
		txt.setAttribute("id","msgTxt");
		txt.innerHTML=document.getElementById(str).innerHTML;
		document.getElementById("msgDiv").appendChild(txt);
}