动态增加与删除DIV标签

var smalllist=document.getElementById("DEVprogressbar"+fname);
if(smalllist==null){
var list=document.getElementById("recordlist");
var content="<div id=\""+"DEVprogressbar"+fname+"\"></div>";
list.innerHTML=list.innerHTML+content;
}else
{
document.getElementById("DEVprogressbar"+fname).innerHTML = "中心录像,当前下载进度:" + pct + "%" ;
    if(pct==100){
    document.getElementById("DEVprogressbar"+fname).removeNode(true);
//alert("设备录像文件下载完毕！");
    }
}