code Macromedia via dreamweaver de daube:
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];}
}
pour le JS
<body bgcolor="#003b78" text="#000000" onLoad="MM_preloadImages('/image/accueil_ro
ll.gif','/image/histoire_roll.gif
9;,'/image/metiers_roll.gif','/i
mage/annuaire_roll.gif','/image/public
ations_roll.gif','/image/certification
_roll.gif','/image/formation_roll.gif
','/image/espace_roll.gif','
;/image/contact_roll.gif','/image/menu
1_roll.gif','/image/drapo_roll.gif
39;,'/image/menu2_roll.gif','/im
age/menu3_roll.gif'
">
pour le body
<a href="/" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('accueil1',
'','/image/accueil_roll.gif
9;,1)"><img name="accueil1" src="/image/accueil.gif" width="113" height="25" border="0"></a>
pour une image type ....