function preload ()
{
    var l1;

    l1 = new Image ();
    l1.src = "/images/logotype_on.gif";
}

function home_over (img)
{
    document.images[img].src = "/images/" + img + "_on.gif";
}

function home_out(img)
{
    document.images[img].src = "/images/" + img + "_off.gif";
}


<!-- NAV ROLLOVERS

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];}
}
//-->

// The number of images available to randomize from 0 to (numOfImages-1)
var numOfLogos = 7;
var numOfPhotos = 2;


// this function rotates the generic images everytime a page loads
function rotateImages ()
{
    var r_num, r_img;

    if (document.images['logo'])
    {
        r_num = Math.floor(Math.random() * numOfLogos);
        r_img = "/images/logo_" + r_num + ".gif";
        document.images['logo'].src = r_img;
    }

    if (document.images['photo'])
    {
        r_num = Math.floor(Math.random() * numOfPhotos);
        r_img = "/images/photo_" + r_num + ".gif";
        document.images['photo'].src = r_img;
    }

   
}