十字军之王 可玩教皇:请问这段代码是什么意思

<SCRIPT language=JavaScript1.2>
<!--
var sliderwidth=530
var sliderheight=133
var slidespeed=2

var leftrightslide=new Array()
var finalslide=''
leftrightslide[0]='<a href="zyhcj.htm"><images src="CJ1.GIF" border=0></a>'
var copyspeed=slidespeed
for (i=0;i<leftrightslide.length;i++)
finalslide=finalslide+leftrightslide[i]+"  "

if (document.all){
document.write('<marquee id="ieslider" scrollAmount=0 style="width:'+sliderwidth+'">'+finalslide+'</marquee>')
ieslider.onmouseover=new Function("ieslider.scrollAmount=0")
ieslider.onmouseout=new Function("if (document.readyState=='complete') ieslider.scrollAmount=slidespeed")
}

function regenerate(){
window.location.reload()
}
function regenerate112(){
if (document.layers){
document.ns_slider01.visibility="show"
setTimeout("window.onresize=regenerate",450)
intializeleftrightslide()
}
if (document.all)
ieslider.scrollAmount=slidespeed
}

function intializeleftrightslide(){
document.ns_slider01.document.ns_slider02.document.write('<nobr>'+finalslide+'</nobr>')
document. ns_slider01.document.ns_slider02.document.close()
thelength=document.ns_slider01.document.ns_slider02.document.width
scrollslide()
}

function scrollslide(){
if (document.ns_slider01.document.ns_slider02.left>=thelength*(-1)){
document.ns_slider01.document.ns_slider02.left-=slidespeed
setTimeout("scrollslide()",100)
}
else{
document.ns_slider01.document.ns_slider02.left=sliderwidth
scrollslide()
}
}
window.onload=regenerate112

//-->
</SCRIPT>
修改时只需修改<a href="zyhcj.htm"><images src="CJ1.GIF" border=0></a>。为什么我修改了还不显示呢？