Libra Man

动态创建弹出div
answer：形式如：
function createDiv(){
var msgObj=document.createElement("div")
msgObj.setAttribute("id","msgDiv");
msgObj.setAttribute("align","center");
msgObj.style.background="white";
msgObj.style.border="1px solid #0000FF";
msgObj.style.position = "absolute";
msgObj.style.left = "55%";
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 = 300 + "px";
msgObj.style.height =120 + "px";
msgObj.style.textAlign = "center";
msgObj.style.lineHeight ="25px";
msgObj.style.visibility = 'visible';
msgObj.style.zIndex = "10001";
var title=document.createElement("h4");
title.setAttribute("id","msgTitle");
title.setAttribute("align","left");
title.style.margin="0";
title.style.padding="3px";
title.style.background="#0000FF";
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 #0000FF";
title.style.height="15px";
title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
title.style.color="white";
title.style.cursor="pointer";
title.innerHTML="信息提示";
document.body.appendChild(msgObj);
document.getElementById("msgDiv").appendChild(title);
var txt=document.createElement("p");
txt.style.margin="1em 0"
txt.setAttribute("id","msgTxt");
var str = "确定删除？";
txt.innerHTML=str;
document.getElementById("msgDiv").appendChild(txt);
var txt1=document.createElement("p");
txt1.style.margin="1em 0"
txt1.setAttribute("id","ggg");
var str = "<input type='button' value='确定'/> "
txt1.innerHTML=str;
document.getElementById("msgDiv").appendChild(txt1);
}