function over(im){
  eval("document."+im+".src='images/menu/"+im+"On.gif'");
}

function out(im){
  eval("document."+im+".src='images/menu/"+im+"Off.gif'");
}

/* on precharge les images de substitution pour les icônes */
i1 = new Image;
i1.src = "images/icones/txtMap.png";
i2 = new Image;
i2.src = "images/icones/txtLiens.png";
i3 = new Image;
i3.src = "images/icones/txtMail.png";
i4 = new Image;
i4.src = "images/icones/white.png";
i3.src = "images/icones/txtMail.png";
i5 = new Image;
i5.src = "images/icones/txtCotis.png";