btn_en_on=new Image(15,128);
btn_en_on.src="_images/btn_en_on.gif";
btn_en_off=new Image(15,128);
btn_en_off.src="_images/btn_en_off.gif";

btn_contact_on=new Image(16,128);
btn_contact_on.src="_images/btn_contact_on.gif";
btn_contact_off=new Image(16,128);
btn_contact_off.src="_images/btn_contact_off.gif";

btn_accueil_on=new Image(21,81);
btn_accueil_on.src="_images/btn_accueil_on.gif";
btn_accueil_off=new Image(21,81);
btn_accueil_off.src="_images/btn_accueil_off.gif";

btn_guide_on=new Image(21,81);
btn_guide_on.src="_images/btn_guide_on.gif";
btn_guide_off=new Image(21,81);
btn_guide_off.src="_images/btn_guide_off.gif";

btn_signet_on=new Image(21,81);
btn_signet_on.src="_images/btn_signet_on.gif";
btn_signet_off=new Image(21,81);
btn_signet_off.src="_images/btn_signet_off.gif";

btn_offre_on=new Image(21,81);
btn_offre_on.src="_images/btn_offre_on.gif";
btn_offre_off=new Image(21,81);
btn_offre_off.src="_images/btn_offre_off.gif";

btn_ufc_on=new Image(21,79);
btn_ufc_on.src="_images/btn_ufc_on.gif";
btn_ufc_off=new Image(21,79);
btn_ufc_off.src="_images/btn_ufc_off.gif";

box_refer_on=new Image(71,91);
box_refer_on.src="_images/box_refer_on.jpg";
box_refer_off=new Image(71,91);
box_refer_off.src="_images/box_refer_off.jpg";

box_run_on=new Image(71,89);
box_run_on.src="_images/box_run_on.jpg";
box_run_off=new Image(71,89);
box_run_off.src="_images/box_run_off.jpg";

box_couple_on=new Image(69,91);
box_couple_on.src="_images/box_couple_on.jpg";
box_couple_off=new Image(69,91);
box_couple_off.src="_images/box_couple_off.jpg";

box_word_on=new Image(69,89);
box_word_on.src="_images/box_word_on.jpg";
box_word_off=new Image(69,89);
box_word_off.src="_images/box_word_off.jpg";

box_coach_on=new Image(69,89);
box_coach_on.src="_images/box_coach_on.jpg";
box_coach_off=new Image(69,89);
box_coach_off.src="_images/box_coach_off.jpg";

box_bottom_on=new Image(16,349);
box_bottom_on.src="_images/box_bottom_on.gif";
box_bottom_off=new Image(16,349);
box_bottom_off.src="_images/box_bottom_off.gif";

jdr_try_on=new Image(24,325);
jdr_try_on.src="_images/jdr_try_on.gif";
jdr_try_off=new Image(24,325);
jdr_try_off.src="_images/jdr_try_off.gif";

jdr_again_on=new Image(24,325);
jdr_again_on.src="_images/jdr_again_on.gif";
jdr_again_off=new Image(24,325);
jdr_again_off.src="_images/jdr_again_off.gif";

jdr_train_on=new Image(24,325);
jdr_train_on.src="_images/jdr_train_on.gif";
jdr_train_off=new Image(24,325);
jdr_train_off.src="_images/jdr_train_off.gif";

jdr_perfect_on=new Image(24,325);
jdr_perfect_on.src="_images/jdr_perfect_on.gif";
jdr_perfect_off=new Image(24,325);
jdr_perfect_off.src="_images/jdr_perfect_off.gif";

jdr_revise_on=new Image(24,325);
jdr_revise_on.src="_images/jdr_revise_on.gif";
jdr_revise_off=new Image(24,325);
jdr_revise_off.src="_images/jdr_revise_off.gif";



function rollIn(imgName) {
  document[imgName].src=eval(imgName + "on.src");
	}

function rollOut(imgName) {
  document[imgName].src=eval(imgName + "off.src");
	}