idc服务商广东排名:对联广告代码标注

有一个对联广告的代码，我不太清楚是什么意思，请大家为下面的这段对联广告标上注释，本人将非常之感谢：var ad_float_left_src ="http://www.happydu.com/image/logo_exchange.gif";
var ad_float_left_url ="http://www.happydu.com";
var ad_float_left_type = "";
document.ns = navigator.appName == "Microsoft Internet Explorer"
var imgheight_close
var imgleft
window.screen.width>800 ? imgheight_close=120:imgheight_close=120
window.screen.width>800 ? imgleft=8:imgleft=122
function myload()
{
myleft.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight_close;
myleft.style.left=imgleft;
leftmove();
}
function leftmove()
{
myleft.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight_close;
myleft.style.left=imgleft;
setTimeout("leftmove();",50)
}
function MM_reloadPage(init) { //reloads the window if Nav4 resized
if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true)

function close_float_left(){
myleft.style.visibility='hidden';
}

document.write("<div id=myleft style='position: absolute;width:80;top:300;left:5;visibility: visible;z-index: 1'>"
+"<style>"
+"A.closefloat:link,A.refloat:visited {text-decoration:none;color:#000000;font-size:12px}"
+"A.closefloat:active,A.refloat:hover {text-decoration:underline;color:#0000FF;font-size:12px}"
+"</style>"
+"<table border=0 cellpadding=0 cellspacing=0><tr><td>");

if(document.ns){
if(ad_float_left_type!="swf")
document.write("<a href='" + ad_float_left_url + "' target = '_blank'><img src='" + ad_float_left_src + "' WIDTH=88 height=31 border = 0></a>");
else
document.write("<EMBED src='" + ad_float_left_src + "' quality=high WIDTH=80 HEIGHT=80 TYPE='application/x-shockwave-flash' id=changhongout ></EMBED>");

document.write("</td></tr><tr><td width=80 height=20 align=right><a href='javascript:close_float_left();void(0);' class=closefloat><b><font color=#ff0000>关闭</font></b></a></td></tr>"
+"</table>"
+"</div>");

myload()}

把上面的代码另存为一个*.JS文件，然后在想实现此效果的页面用<script src="*.js"></SCRIPT>调用即可，*代表你另存的文件名！注意修改广告图片地址和连接地址！相应的参数可以根据页面自行调整。