Hi, this is my fisrst post!!

Im mainly into webdesign, but am familiar with HTML/ASP, Ive created a site using Dreamweaver MX and part of the <HEAD> code looks like this :-

<style type="text/css">
body {
margin-bottom: 0px;
.awstitle { font-family: "Times New Roman"; font-size: 24px; font-weight: bold}
.awstext { font-family: "Times New Roman"; font-size: 16px; font-weight: 100}
<script language="JavaScript">
function MM_swapImgRestore() { //v3.0
var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;

function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}

function MM_findObj(n, d) { //v4.0
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
if(!x && document.getElementById) x=document.getElementById(n); return x;

function MM_swapImage() { //v3.0
var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}


Could someone please help and advise me on how I can tidy up this code to improve speed, etc.

1) Should the CSS be in a seperate file?
2) Should Script be in a different file?

If so, how is this achieved?

Also because it was created in Dreameaver, to be honest i dont even know what the code is doing!