无边框弹出框

<script type="text/javascript">
var Obj=''
document.onmouseup=MUp
document.onmousemove=MMove

function MDown(Object){
Obj=Object.id
document.all(Obj).setCapture()
pX=event.x-document.all(Obj).style.pixelLeft;
pY=event.y-document.all(Obj).style.pixelTop;
}

function MMove(){
if(Obj!=''){
  document.all(Obj).style.left=event.x-pX;
  document.all(Obj).style.top=event.y-pY;
  }
}

function MUp(){
if(Obj!=''){
  document.all(Obj).releaseCapture();
  Obj='';
  }
}
function openWithIframe(tit,url,w,h){
 var sWidth,sHeight;
 sWidth=document.body.clientWidth;
 sHeight=document.body.scrollHeight;
 var bgObj=document.createElement("div");
 bgObj.setAttribute('id','bgDiv');
 bgObj.style.position="absolute";
 bgObj.style.top="0";
 bgObj.style.background="#000000";
 bgObj.style.filter="Alpha(Opacity=30);";
 bgObj.style.left="0";
 bgObj.style.width=sWidth + "px";
 bgObj.style.height=sHeight + "px";
 bgObj.style.zIndex = "10000";
    document.body.appendChild(bgObj);

    massage_box.style.left = (document.body.clientWidth - w) / 2;
    massage_box.style.top = (screen.height - h) / 2-80;
    massage_box.style.screenx = (document.body.clientWidth - w) / 2;//仅适用于Netscape
    massage_box.style.screeny = (screen.height - h) / 2-80;//仅适用于Netscape
    massage_box.style.width = w+"px";
    massage_box.style.height = h+"px";
    pop_title.innerHTML=tit;
    massage_box.style.display=''
    var popiframe='<iframe src="'+url+'" width="'+(w-11)+'px"  height="'+(h-36)+'px" frameborder=0 scrolling=no></iframe>';
    pop_iframe.innerHTML=popiframe;
}
function closeWithIframe(){
    massage_box.style.display="none";
    document.body.removeChild(document.getElementById("bgDiv"));
}
document.write('<div id="massage_box" style="position:absolute; FILTER: progid:DXImageTransform.Microsoft.DropShadow();z-index:10001;display:none">');
document.write('<div style="border-width:1 1 3 1; width:100%; height:100%; background:#fff; color:#57A01B; font-size:12px; line-height:150%">');
document.write('<div onmousedown=MDown(massage_box) style="background:#57A01B; height:20px; font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px;color:#fff;cursor:move;padding:0 0 4px 0">');
document.write('<div style="display:inline; width:200px; position:absolute;padding:3px 0 0 5px" id=pop_title></div>');
document.write('<span onClick="closeWithIframe()" style="float:right; display:inline; cursor:hand;padding:3px 5px 0 0;font-size:12px">关闭</span>');
document.write('</div>');
document.write('<div style="padding:5px" id=pop_iframe></div>');
document.write('</div>');
document.write('</div>');
</script>
调用方法：<a href=# onClick="openWithIframe('ajax提示框','www.programlife.cn',300,200);">ajax提示框</a>