Help conver VBscript to JavaScript

[PhotoJoe]

I hope someone can help me with this. I trying to convert some VBscript to JavaScript so that a webpage will be cross browser viewable.

I think I have most of this figured out. But in the code below that I marked in red is what I don't understand. Could someone help convert this to javascript or maybe tell me what the varibale "data" would containg?

Here is the code for a sub that I'm trying to convert:

REM Initialize
sub setUp()
	REM Get window dimensions
	wW=w.clientWidth
	wH=w.offsetHeight
	sH=w.scrollHeight
	REM Set the scroll Height
	bH=wH
	if sH>wH then bH=sH
	for i=1 to borders
		y(i)=-(pH(i))
		REM Set margins
		w.style.marginLeft=pW(1)
		w.style.marginRight=pW(2)
		chkPics(i)=numPics(i)
		REM Adjust number of pics for message length
		if int(bH/pH(i))>numPics(i) then
			chkPics(i)=int(bH/pH(i))+3
			data=""
			for j=numPics(i)+1 to chkPics(i)

data=data&&quot;<IMG src='&quot;&document.all(&quot;bkg&quot;&i).src&&quot;'>&quot;
next
document.all(&quot;box&quot;&i).insertAdjacentHTML &quot;BeforeEnd&quot;, data

		end if
		REM Limit visible area
		document.all("container"&i).style.width=pW(i)
		document.all("container"&i).style.height=bH
		if i=1 then
			document.all("container"&i).style.left=0
		else
			document.all("container"&i).style.left=wW-pW(i)
		end if
		document.all("container"&i).style.top=0
		REM Set the size of the scrolling area
		document.all("box"&i).style.height=bH+3*pH(i)
		document.all("box"&i).style.width=pW(i)
		document.all("box"&i).style.left=0
		document.all("box"&i).style.top=y(i)
	next
	if calcFlag=1 then
		calcFlag=0
		setUp
	end if
	REM Start the scroll.
	SF
end sub