//alert效果改善
//str  显示字符，用超链接<a>
// goToUrl  点击关闭跳转到的URL
//调用：<input type="button" value="单击1" name="btnClick1" onClick="sAlert('<font color=\'blue\' style=\'font-size:14px;\'><strong><a href=\'folder/test.html\'>登陆成功，欢迎您！</a></strong></font>','index.html')" >
//=================================================
function sAlert(str,goToUrl){
	var msgw,msgh,bordercolor;
	msgw=400;//提示窗口的宽度
	msgh=100;//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;
	sHeight=screen.height;
	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);
	
	var msgObj=document.createElement("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 = "50%";
	msgObj.style.top = "50%";
	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");
	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&nbsp;<img src='btn_close.jpg' align='absmiddle'>";
	title.onclick=function(){
		document.body.removeChild(bgObj);
		document.getElementById("msgDiv").removeChild(title);
		document.body.removeChild(msgObj);
		var url=goToUrl;
		if (url!=""){ 
			location.href=url;
		}
	}
	document.body.appendChild(msgObj);
	document.getElementById("msgDiv").appendChild(title);
	var txt=document.createElement("p");
	txt.style.margin="1em 0"
	txt.setAttribute("id","msgTxt");
	txt.innerHTML=str;
	document.getElementById("msgDiv").appendChild(txt);
}