if (document.images) {
     img1devon = new Image(); img1devon.src = "images/development/branddev_on.jpg";
     img2devon = new Image(); img2devon.src = "images/development/webdesign_on.jpg";
     img3devon = new Image(); img3devon.src = "images/development/webdev_on.jpg";
     img4devon = new Image(); img4devon.src = "images/development/appdev_on.jpg";
     img5devon = new Image(); img5devon.src = "images/development/marketing_on.jpg";         
}
if (document.images) {
    img1devoff = new Image(); img1devoff.src = "images/development/branddev_off.jpg";
    img2devoff = new Image(); img2devoff.src = "images/development/webdesign_off.jpg";
    img3devoff = new Image(); img3devoff.src = "images/development/webdev_off.jpg";
    img4devoff = new Image(); img4devoff.src = "images/development/appdev_off.jpg";
    img5devoff = new Image(); img5devoff.src = "images/development/marketing_off.jpg";
}