if (navigator.appVersion.indexOf("2.") != -1) {check = false;}
if ((navigator.appVersion.indexOf("3.") != -1) && (navigator.appName.indexOf("Explorer") != -1)) {check = false;  } else {check = true;}

image1= new Image();
image1.src = "images/home_off.gif";
image1on = new Image();
image1on.src = "images/home_on.gif";
image2= new Image();
image2.src = "images/products_off.gif";
image2on = new Image();
image2on.src = "images/products_on.gif";
image3= new Image();
image3.src = "images/jobs_off.gif";
image3on = new Image();
image3on.src = "images/jobs_on.gif";
image4= new Image();
image4.src = "images/about_off.gif";
image4on = new Image();
image4on.src = "images/about_on.gif";
image5= new Image();
image5.src = "images/link_off.gif";
image5on = new Image();
image5on.src = "images/link_on.gif";
image6= new Image();
image6.src = "images/corp_off.gif";
image6on = new Image();
image6on.src = "images/corp_on.gif";

function imageon(name)   {document[name].src = eval(name + "on.src"); }
function imageoff(name)  {document[name].src = eval(name + ".src"); }
function on(name)  {if (check == true){imageon(name); } }
function off(name)  {if (check == true){imageoff(name); } }



<!--
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];}
}
//-->