if (document.images) {
     button1 = new Image
     button2 = new Image

     button1.src = 'images/btn_fr_over.jpg'
     button2.src = 'images/btn_fr.jpg'
 }
 
 if (document.images) {
     button3 = new Image
     button4 = new Image

     button3.src = 'images/btn_en_over.jpg'
     button4.src = 'images/btn_en.jpg'
 }
 
  if (document.images) {
     button5 = new Image
     button6 = new Image

     button5.src = 'images/btn_es_over.jpg'
     button6.src = 'images/btn_es.jpg'
 }
 
 if (document.images) {
     button7 = new Image
     button8 = new Image

     button7.src = 'images/btn_distrib_over.jpg'
     button8.src = 'images/btn_distrib.jpg'
 }
 
 if (document.images) {
     button9 = new Image
     button10 = new Image

     button9.src = 'images/btn_credit_over.jpg'
     button10.src = 'images/btn_credit.jpg'
 }
 
  if (document.images) {
     button11 = new Image
     button12 = new Image

     button11.src = 'images/btn_contact_over.jpg'
     button12.src = 'images/btn_contact.jpg'
 }