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>
</head>
<body onLoad="MM_preloadImages('img/1a.gif','img/2a.gif','img/3a.gif')">
<p><strong>Dreamweaver MX2004で作成</strong></p>
<p>
<a href="http://www.paltis.co.jp/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image1','','img/1a.gif',1)"><img src="img/1.gif" alt="テスト１" name="Image1" width="150" height="113" border="0"></a><a href="http://www.flexjapan.com/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image2','','img/2a.gif',1)"><img src="img/2.gif" alt="テスト３" name="Image2" width="150" height="113" border="0"></a><a href="http://homepage3.nifty.com/YT7/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image3','','img/3a.gif',1)"><img src="img/3.gif" alt="テスト３" name="Image3" width="150" height="113" border="0"></a></p>
</body>
</html>
Dreamweaver MX2004で作成