function chimg(i,s){
 document.images[i].src = s;
}
var img = Array();
 img[0] = new Image();
 img[0].src='img/menu_home_h.gif';
 img[1] = new Image();
 img[1].src='img/menu_marlite_h.gif';
 img[2] = new Image();
 img[2].src='img/menu_laminates_h.gif';
 img[3] = new Image();
 img[3].src='img/menu_flotation_h.gif';
 img[4] = new Image();
 img[4].src='img/menu_contact_h.gif';