if (document.images) {

     ab1 = new Image
     ab2 = new Image
     ac1 = new Image
     ac2 = new Image
     ad1 = new Image
     ad2 = new Image
     ae1 = new Image
     ae2 = new Image
     af1 = new Image
     af2 = new Image

     ab1.src = 'http://daandoesborgh.nl/graphics/nieuws.off.png'
     ab2.src = 'http://daandoesborgh.nl/graphics/nieuws.on.png'
     ac1.src = 'http://daandoesborgh.nl/graphics/optredens.off.png'
     ac2.src = 'http://daandoesborgh.nl/graphics/optredens.on.png'
     ad1.src = 'http://daandoesborgh.nl/graphics/publicaties.off.png'
     ad2.src = 'http://daandoesborgh.nl/graphics/publicaties.on.png'
     ae1.src = 'http://daandoesborgh.nl/graphics/contact.off.png'
     ae2.src = 'http://daandoesborgh.nl/graphics/contact.on.png'
     af1.src = 'http://daandoesborgh.nl/graphics/info.off.png'
     af2.src = 'http://daandoesborgh.nl/graphics/info.on.png'

}