Problems exporting to external js file

Question

I wanted to keep my pages as clutter free as possible and also be validated so  wanted to move as much javascript to an external file.
I followed the instructions in this discussion http://forums.adobe.com/thread/481537?start=0&tstart=0
to the letter and exported most of the javascript in the template into an external file but as soon as I did that DW said that there were now syntax errors in the code in the external js file which previously worked perfectly while in the head of the template. When I deleted the javascript with the offending line of code DW pointed out further syntax errors including Google analytics code! As well as off the rack script that I had copied and pasted for putting social media buttons on the page.
Needless to say that when I linked the .js to my template they didn't work. But when I put them back in the head they worked perfectly.
What am I doing wrong? Here is the javascript. The emphasized bold italics are the places that DW says are syntax errors.
// JavaScript Document
<!--Bread crumbs code-->
<script type="text/javascript">
function breadCrumbs(base,delStr,defp,cStyle,tStyle,dStyle,nl) { // by Paul Davis - http://www.kaosweaver.com
loc=window.location.toString();subs=loc.substr(loc.indexOf(base)+base.length+1).split("/") ;
document.write('<a href="'+getLoc(subs.length-1)+defp+'" class="+cStyle+">Home</a>  '+'<span class="+dStyle+">'+delStr+'</span> ');
a=(loc.indexOf(defp)==-1)?1:2;for (i=0;i<(subs.length-a);i++) { subs[i]=makeCaps(unescape(subs[i]));
document.write('<a href="'+getLoc(subs.length-i-2)+defp+'" class="+cStyle+">'+subs[i]+'</a>  '+'<span class="+dStyle+">'+delStr+'</span> ');}
if (nl==1) document.write("<br>");document.write('<span class="+tStyle+">'+document.title+'</span>');
function makeCaps(a) {
  g=a.split(' ');for (l=0;l<g.length;l++) g[l]=g[l].toUpperCase().slice(0,1)+g[l].slice(1);
  return g.join(" ");
function getLoc(c) {
  var d="";if (c>0) for (k=0;k<c;k++) d=d+"../"; return d;
</script>
<!--Google analytics code-->
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try {
var pageTracker = _gat._getTracker("UA-8313452-1");
pageTracker._trackPageview();
} catch(err) {}</script>
<!--Script for adding Social Media Share Buttons-->       
<script type="text/javascript">var switchTo5x=true;</script>
<script type="text/javascript" src="http://w.sharethis.com/button/buttons.js"></script>
<script type="text/javascript">stLight.options({publisher: "380208c3-e9f3-4198-8bef-1de3e344f3ae", doNotHash: true, doNotCopy: true, hashAddressBar: false});</script>

Answer 1

I asked my system adminstrator (he does it for me as a favor) who is a security expert in his day job about SSIs and this was his response.
"Server side includes? No, not if you want some semblance of security.
SSI went out of use with the 1990s."
There does seem to be a security risk involved
http://httpd.apache.org/docs/current/misc/security_tips.html#ssi
And according to IBM http://tinyurl.com/bh2v442