function Alert(str) {

var msgw,msgh,bordercolor;

msgw=150;//提示窗口的宽度

msgh=80;//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;

//获取当前窗口尺寸

sWidth = document.body.offsetWidth;

sHeight = document.body.offsetHeight;

// //背景div

var bgObj=document.createElement("div");

bgObj.setAttribute('id','alertbgDiv');

bgObj.style.position="absolute";

bgObj.style.top="0";

bgObj.style.background="#E8E8E8";

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);

//创建提示窗口的div

var msgObj = document.createElement("div")

msgObj.setAttribute("id","alertmsgDiv");

msgObj.setAttribute("align","center");

msgObj.style.background="white";

msgObj.style.border="1px solid " + bordercolor;

msgObj.style.position = "absolute";

msgObj.style.left = "50%";

msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";

//窗口距离左侧和顶端的距离

msgObj.style.marginLeft = "-225px";

//窗口被卷去的高+（屏幕可用工作区高/2）-150

msgObj.style.top = document.body.scrollTop+(window.screen.availHeight/2)-150 +"px";

msgObj.style.width = msgw + "px";

msgObj.style.height = msgh + "px";

msgObj.style.textAlign = "center";

msgObj.style.lineHeight ="25px";

msgObj.style.zIndex = "10001";

document.body.appendChild(msgObj);

//提示信息标题

var title=document.createElement("h4");

title.setAttribute("id","alertmsgTitle");

title.setAttribute("align","left");

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.innerHTML="提示信息";

document.getElementById("alertmsgDiv").appendChild(title);

//提示信息

var txt = document.createElement("p");

txt.setAttribute("id","msgTxt");

txt.style.margin="16px 0";

txt.innerHTML = str;

document.getElementById("alertmsgDiv").appendChild(txt);

//设置关闭时间

window.setTimeout("closewin()",400);

}

function closewin() {

document.body.removeChild(document.getElementById("alertbgDiv"));

document.getElementById("alertmsgDiv").removeChild(document.getElementById("alertmsgTitle"));

document.body.removeChild(document.getElementById("alertmsgDiv"));

}

Alert(111)