How to <.br> in Javascript

I have the following script which I intend to use for my page as a visitor counter.

<script type="text/javascript" language="javascript">
function whosOnline() { popup=window.open('vcounter.php?view=whosonline', 'whosonline', 'toolbars=0, scrollbars=1, location=0, statusbars=0, menubars=0, resizable=1, width=500, height=300, left = 150, top = 80'); }</script>
$lang[counter_since] 27/02/2003
$lang[counter_today]
$today $lang[counter_total] $total
$lang[counter_today]: $currentdate $currenttime GMT+$timezone
$lang[counter_uonline]
: [

$useronline

+ $lang[counter_record]: [ $uonlinerecord]

the scripts loads at my page – https://neoro.lysium.net/v2/blog/wordpress/wordpress/basic.php
(at the very top of the page)
but , how can I make then be arranged in an vertical order ?
I tried to insert a </br> tag right after a variable , but then the wc3 validator gives me an error relating to the changes which I just did. I’m don’t really understnd the explanations given on the page.
Please help.