I created a mouseover using dreamweaver, and I want to put the script in an external file. This was the script from the head tag:
<script type="text/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) { //v4.01
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 && d.getElementById) x=d.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];}
}
//-->
</script>

I created a file named "mouseover.js" and put it in the same directory. I then put a link in my head tag:
<script language="JavaScript" type="text/javascript" src="mouseover.js"></script>

The mouseover is not working. It worked when directly in my head tag. Can anyone offer suggestions. Thanks!

in the script file you shouldn't write script tags

<script type="text/JavaScript">
...
</script>

make sure javascript code is written directly without those tags

Thank you!
Do you know if there is a way to do a "clicked" state. The client wants the initial state, a rollover, and then a "clicked state".

Try using CSS. Using JavaScript exclusively for mouseovers is overkill and isn't always cross-browser compliant.

-Moatist

Using JavaScript for mouseovers?? Hasn't that practice been outdated since the turn of the century? Simple CSS will do you much better, plus it still works if JavaScript is turned off.