能帮我解释什么意思吗

俬錛ヤ

if not checkoption(opt,"noframe") then
    zcss1="bgcolor=""#ffffff"""
  else
    zcss1=""
  end if   
  if not checkoption(opt,"noframe") then
    zcss2="bgcolor=""#e0e0e0"""
  else
    zcss2=""
  end if  

-------------------------------
<% sub slideimgup(awidth,aheight,avar) %>

<SCRIPT language=javascript1.2>
var scrollerwidth=<%=awidth%>
var scrollerheight=<%=aheight%>
var scrollerbgcolor='white'
//3000 miliseconds=3 seconds
var pausebetweenimages=3000
var slidespeed=5
var slideimages=new Array()
<%for i=0 to ubound(avar)
%>
slideimages[<%=i%>]='<%=avar(i)%>';
<%
next %>

//slideimages[1]=slideimages[0]
//slideimages[2]=slideimages[0]
//slideimages[3]=slideimages[0]
//slideimages[4]=slideimages[0]
//slideimages[5]=slideimages[0]
//slideimages[6]=slideimages[0]
//slideimages[7]=slideimages[0]
//slideimages[8]=slideimages[0]
//slideimages[9]=slideimages[0]
//slideimages[10]=slideimages[0]
//slideimages[11]=slideimages[0]
//extend this list

///////Do not edit pass this line///////////////////////
   
var copyspeed=slidespeed

if (slideimages.length>2)
i=2
else
i=0


function move1(whichlayer){
tlayer=eval(whichlayer)
if (tlayer.top>0&&tlayer.top<=5){
tlayer.top=0
setTimeout("move1(tlayer)",pausebetweenimages)
setTimeout("move2(document.main.document.second)",pausebetweenimages)
return
}
if (tlayer.top>=tlayer.document.height*-1){
tlayer.top-=copyspeed
setTimeout("move1(tlayer)",100)
}
else{
tlayer.top=scrollerheight
tlayer.document.write(slideimages)

tlayer.document.close()
if (i>=slideimages.length-1)
i=0
else
i++
}
}

function move2(whichlayer){
tlayer2=eval(whichlayer)
if (tlayer2.top>0&&tlayer2.top<=5){
tlayer2.top=0
setTimeout("move2(tlayer2)",pausebetweenimages)
setTimeout("move1(document.main.document.first)",pausebetweenimages)
return
}
if (tlayer2.top>=tlayer2.document.height*-1){
tlayer2.top-=copyspeed
setTimeout("move2(tlayer2)",100)
}
else{
tlayer2.top=scrollerheight
tlayer2.document.write(slideimages)
tlayer2.document.close()

if (i>=slideimages.length-1)
  i=0
else
  i++
}
}

function move3(whichdiv){
tdiv=eval(whichdiv)
if (tdiv.style.pixelTop>0&&tdiv.style.pixelTop<=5){
tdiv.style.pixelTop=0
setTimeout("move3(tdiv)",pausebetweenimages)
setTimeout("move4(second2)",pausebetweenimages)
return
}

if (tdiv.style.pixelTop>=tdiv.offsetHeight*-1){
tdiv.style.pixelTop-=copyspeed
setTimeout("move3(tdiv)",100)

}
else{
tdiv.style.pixelTop=scrollerheight
if (i>slideimages.length-1)  i=0


tdiv.innerHTML=slideimages
if (i>=slideimages.length-1)
  i=0
else
  i++
  
  }
}

function move4(whichdiv){
tdiv2=eval(whichdiv)
if (tdiv2.style.pixelTop>0&&tdiv2.style.pixelTop<=5){
tdiv2.style.pixelTop=0
setTimeout("move4(tdiv2)",pausebetweenimages)
setTimeout("move3(first2)",pausebetweenimages)
return
}
if (tdiv2.style.pixelTop>=tdiv2.offsetHeight*-1){
tdiv2.style.pixelTop-=copyspeed
setTimeout("move4(second2)",100)
}
else{
tdiv2.style.pixelTop=scrollerheight
tdiv2.innerHTML=slideimages
if (i>=slideimages.length-1)
i=0
else
i++
}
}

function startscroll(){
if (document.all){
  move3(first2)
  second2.style.top=scrollerheight
}
else if (document.layers){
  document.main.visibility='show'
  move1(document.main.document.first)
  document.main.document.second.top=scrollerheight+copyspeed
  document.main.document.second.visibility='show'
}
}

window.onload=startscroll

if (document.all){
document.writeln('<center><span id="main2"

style="position:relative;width:'+scrollerwidth+';height:'+scrollerheight+';overflow:hiden;backgrou

nd-color:'+scrollerbgcolor+'">')
document.writeln('<div

style="position:absolute;width:'+scrollerwidth+';height:'+scrollerheight+';clip:rect(0

'+scrollerwidth+' '+scrollerheight+' 0);left:0;top:0">')
document.writeln('<div id="first2" style="position:absolute;width:'+scrollerwidth+';left:0;top:1;"

  onMouseover="copyspeed=0" onMouseout="copyspeed=slidespeed">')
document.write(slideimages[0])
document.writeln('</div>')
document.writeln('<div id="second2" style="position:absolute;width:'+scrollerwidth+';left:0;top:0"

onMouseover="copyspeed=0" onMouseout="copyspeed=slidespeed">')
if (slideimages.length>1) {
  document.write(slideimages[1])
  }
document.writeln('</div>')
document.writeln('</div>')
document.writeln('</span>')
}
</SCRIPT>
<%
end sub%>