if (document.images) {
     button01v1 = new Image
     button01v2 = new Image

     button02v1 = new Image
     button02v2 = new Image

     button03v1 = new Image
     button03v2 = new Image

     button01v1.src = 'images/careernav02off.gif'
     button01v2.src = 'images/careernav02on.gif'

     button02v1.src = 'images/careernav03off.gif'
     button02v2.src = 'images/careernav03on.gif'

     button03v1.src = 'images/careernav04off.gif'
     button03v2.src = 'images/careernav04on.gif'

 }