JavaScript - How Do I Hover Over Text To Change An Image

<script>
function changeImage(filename)
{
   document.mainimage.src = filename;
}
</script>

<img name="mainimage" src="../Images/wedding-photo-01-bride-getting-ready.JPG" title="bride getting ready"/>

<a href="javascript:changeImage('../Images/wedding-photo-01-bride-getting-ready.JPG')">
                <img class="thumbbox" id="mainimage" src="../Images/wedding-photo-01-bride-get-thumb.JPG" alt="wellis photography logo" title="bride getting ready">
</a>

<script type="text/javascript">
document.write(document.getElementById('myimage').title);
</script>

<div class="service_box box1" id="service_box1">
    <a href="#" id="box1_trigger">
        <h3>bla bla</h3>
        <p>bla bla bla bla bla</p>
    </a>
</div>

<script type="text/javascript">
$(document).ready(function() {
	$("#box1_trigger").hover(
		function() {
			$("#service_box1").stop().animate({backgroundPosition:"(0 -250px)"}, "slow");    
		},
		function() {
			$("#service_box1").stop().animate({backgroundPosition: "0 0"}, "slow");  
		}
	);
});
</script>

#service_box1{
	width:318px; height:282px;
	float:left;
	background:url(images/services_panel.png) 0 0 no-repeat;
}
a#box1_trigger{
	width:100%; height:100%;
	float:left;
	display:block;	
}

<script type="text/javascript"><!--//--><![CDATA[//><!--
startList = function() {
	if (document.all&&document.getElementById) {
		navRoot = document.getElementById("nav");
		for (i=0; i<navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
			if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
				}
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
				}
			}
		}
	}
}
window.onload=startList;

//--><!]]></script>

<div id="menuPadding">
	<div id="menu">
<ul id="nav">
<li id="m1"><a href="">HOME</a></li>
<li id="m2">ABOUT US 					       
<ul>
<li><a href="">Our Values</a></li>
<li><a href="">Facilities</a></li>
<li><a href="">Arena</a></li>
<li><a href="">Jobs</a></li>
</ul>
</li>
<li id="m3">SUCCESS 					       
<ul>
<li><a href="">Jobs</a></li>
<li><a href="">Results</a></li>
<li><a href="">Awards</a></li>
<li><a href="">Testimonials</a></li>
</ul>
</li>
</div>
</div>

#menu {
	margin-top: 16px;
	width: 879px;
	height: 30px;
	z-index: 1000;
	font-family: Verdana, Geneva, sans-serif;
	font-size:11px;
	font-weight:bold;
}

#menuPadding {
	margin: 0px 0px 0px 0px;
	padding: 10px 0px 10px 0px;
	text-align:center;
	z-index: 1000;
}

#menuPadding ul {
	height: 29px;
	margin: 0px 0px 0px 0px;
	padding: 5px 0px 5px 0px;
z-index: 1000;
}

#menuPadding ul li {
/*	display: inline;*/
	line-height: 29px;
	padding:0px;
	margin-left:1px;
	display:block;
	float:left;
	font-weight:bold;
	color:#fff;
z-index: 1000;
}

#menuPadding ul li a {
	text-align:center;
z-index: 1000;
}

#menuPadding ul li li {
	padding:0px;
	margin:0px;
z-index: 1000;
}

#menuPadding ul li li a {
	text-align:left;
	padding-left:14px;
	text-transform:uppercase;
z-index: 1000;
	font-size:90%;
}

#menuPadding ul li li a.notupper {
	text-transform:none;
z-index: 1000;
}

/* coloured menus */
#menuPadding ul li#m1 {
	background:#FF0000;
	width:96px;
z-index: 1000;
}

#menuPadding ul li#m1 li {
	background:#FF0000;
	width:146px;
z-index: 1000;
}

#menuPadding ul li#m2 {
	background:#0099CC;
	width:96px;
z-index: 1000;
}

#menuPadding ul li#m2 li {
	background:#0099CC;
	width:166px;
z-index: 1000;
}

#menuPadding ul li#m2 li a {
	width:166px;
z-index: 1000;
}

#menuPadding ul li#m3 {
	background:#999999;
	width:97px;
z-index: 1000;
}

#menuPadding ul li#m3 li {
	background:#999999;
	width:176px;
z-index: 1000;
}

#menuPadding ul li#m3 li a {
	width:176px;
z-index: 1000;
}

#menuPadding ul li#m4 {
	background:#9966CC;
	width:96px;
z-index: 1000;
}

#menuPadding ul li#m4 li {
	background:#9966CC;
	width:156px;
z-index: 1000;
}

#menuPadding ul li#m4 li a {
	width:156px;
z-index: 1000;
}

#menuPadding ul li#m5 {
	background:#AAC619;
	width:96px;
z-index: 1000;
}

#menuPadding ul li#m5 li {
	background:#AAC619;
	width:230px;
	padding-right:20px;
z-index: 1000;
}

#menuPadding ul li#m5 li a {
	width:230px;
z-index: 1000;
}

#menuPadding ul li#m6 {
	background:#FF9900;
	width:97px;
z-index: 1000;
}

#menuPadding ul li#m6 li {
	background:#FF9900;
	width:146px;
z-index: 1000;
}

#menuPadding ul li#m7 {
	background:#FF0099;
	width:97px;
z-index: 1000;
}

#menuPadding ul li#m7 li {
	background:#FF0099;
	width:216px;
	color:#fff;
z-index: 1000;
}

#menuPadding ul li#m7 li a {
	width:216px;
	color:#fff;
z-index: 1000;
}

#menuPadding ul li#m7 li li {
	font-size:87%;
z-index: 1000;
}

#menu li ul ul { /* third-and-above-level lists */
	margin: -30px 0 0 216px;
z-index: 1000;
}

#menu li:hover ul ul, #menu li.sfhover ul ul {
	left: -999em;
z-index: 1000;
}

#menu li:hover ul, #menu li li:hover ul, #menu li.sfhover ul, #menu li li.sfhover ul { /* lists nested under hovered list items */
	left: auto;
z-index: 1000;
}

#menuPadding ul li#m8 {
	background:#660099;
	width:97px;
z-index: 1000;
}

#menuPadding ul li#m8 li {
	background:#660099;
	width:146px;
z-index: 1000;
}

#menuPadding ul li#m9 {
	background:#A80017;
	width:97px;
z-index: 1000;
}

#menuPadding ul li#m9 li {
	background:#A80017;
	width:146px;
z-index: 1000;
}

#menuPadding ul li a:link,#menuPadding ul li a:active,#menuPadding ul li a:visited {
	color:#fff;
z-index: 1000;
}

#menuPadding ul li a:hover {
	color:#000;
z-index: 1000;
}

/* suckerfish */
#menu, #menu ul { /* all lists */
	padding: 0;
	margin: 0;
	list-style: none;
	line-height: 1;color:#fff;
}

#menu a {
	display: block;
	width: 96px;
}

#menu li { /* all list items */
	float: left;
	width: 96px; /* width needed or else Opera goes nuts */
	border-top:1px solid #fff;
}

#menu li ul { /* second-level lists */
	position: absolute;
	background: orange;
	width: 106px;
	left: -999em; /* using left instead of display to hide menus because display: none isn't read by screen readers */
	font-size:90%;
}

#menu li ul ul { /* third-and-above-level lists */
/*	margin: -1em 0 0 96px;*/
	font-size:110%;	
}

#menu li li { 
	font-size:100%;
	color:#fff;
}


#menu li:hover ul ul, #menu li.sfhover ul ul {
	left: -999em;
}

#menu li:hover ul, #menu li li:hover ul, #menu li.sfhover ul, #menu li li.sfhover ul { /* lists nested under hovered list items */
	left: auto;
}

$(document).ready(function(){
$(".thumbs img").fadeTo("slow", 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads

$(".thumbs img").hover(function(){
$(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover
},function(){
$(this).fadeTo("slow", 0.6); // This should set the opacity back to 60% on mouseout
});
});

<html>
<head>

<script src="jquery-1.3.1.min.js" type="text/javascript" ></script>
<script src="jquery.easing.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
    $('li.image').css({opacity: 0});
  
    $('li.image').hover(function(){
        $(this).animate({opacity: 1},400);
    }, function(){
        $(this).animate({opacity: 0},400);
 });
});
</script>

<style>
.ddsmoothmenu{
background-color:Gray;
width: 100%; height:27px; 
margin:0 auto;
padding:0;
}

.ddsmoothmenu ul{z-index:1; margin: 0; padding: 0; list-style-type: none;}
.ddsmoothmenu ul li{position: relative; float: left; }
.ddsmoothmenu  a{display:block; color: white;   border-right: 0px solid #778; color: #2d2b2b; text-decoration: none; font: 11px Verdana; font-weight:bold;}
.ddsmoothmenu ul li a:link, .ddsmoothmenu ul li a:visited{color: yellow; z-index:50; line-height:27px;}

.image {
	line-height:27px;
	height:27px;
	background:url(images/button.gif) no-repeat right top; 
	padding-right:30px; 
	display:inline-block;
}

.image ins { 
	background:url(images/button.gif) no-repeat left top; 
	height:27px;
	line-height:27px;
	display:inline-block;
	padding-left:30px;
}
 
	image:hover {background-position:right -155px;}
	image:hover ins {background-position:left -155px;}
</style>
</head>

<div id="smoothmenu1" class="ddsmoothmenu ">
<ul>
<li class="image"><a href="#"><ins>Home</ins></a></li>
<li class="image"><a href="#"><ins>Products</ins></a></li>
<li class="image"><a href="#"><ins>Services</ins></a></li>
<li class="image"><a href="#"><ins>Contact Us</ins></a></li>
</ul>
</div>
</html>

var ddimgtooltip={

	tiparray:function(){
		var tooltips=[]
		//define each tooltip below: tooltip[inc]=['path_to_image', 'optional desc', optional_CSS_object]
		//For desc parameter, backslash any special characters inside your text such as apotrophes ('). Example: "I\'m the king of the world"
		//For CSS object, follow the syntax: {property1:"cssvalue1", property2:"cssvalue2", etc}

		tooltips[0]=["http://i1189.photobucket.com/albums/z423/creativeedge1/Golf-Popup1.gif", "", {background:"#FFFFFF", color:"black", border:"2px ridge #0099FF"}]
		tooltips[1]=["http://i1189.photobucket.com/albums/z423/creativeedge1/hospitals_popup_copy.gif", "", {background:"#FFFFFF", color:"black", border:"2px ridge #0099FF"}]
		tooltips[2]=["../dynamicindex14/winter.jpg"]
		tooltips[3]=["../dynamicindex17/bridge.gif", "Bridge to somewhere.", {background:"white", font:"bold 12px Arial"}]

		return tooltips //do not remove/change this line
	}(),

	tooltipoffsets: [20, -30], //additional x and y offset from mouse cursor for tooltips

var ddimgtooltip={

	tiparray:function(){
		var tooltips=[]
		//define each tooltip below: tooltip[inc]=['path_to_image', 'optional desc', optional_CSS_object]
		//For desc parameter, backslash any special characters inside your text such as apotrophes ('). Example: "I\'m the king of the world"
		//For CSS object, follow the syntax: {property1:"cssvalue1", property2:"cssvalue2", etc}

		tooltips[0]=[<link href="<?php bloginfo('template_directory'); ?>/index2.php", "", {background:"#FFFFFF", color:"black", border:"2px ridge #0099FF"}]
		tooltips[1]=["http://i1189.photobucket.com/albums/z423/creativeedge1/hospitals_popup_copy.gif", "", {background:"#FFFFFF", color:"black", border:"2px ridge #0099FF"}]
		tooltips[2]=["../dynamicindex14/winter.jpg"]
		tooltips[3]=["../dynamicindex17/bridge.gif", "Bridge to somewhere.", {background:"white", font:"bold 12px Arial"}]

		return tooltips //do not remove/change this line
	}(),

	tooltipoffsets: [20, -30], //additional x and y offset from mouse cursor for tooltips