ban_img = new  Array("banner1h.gif","banner2h.gif","banner1h.gif","banner2h.gif");
ban_l_img = new  Array("banner1hb.gif","banner2hb.gif","banner1hb.gif","banner2hb.gif");
ban_url = new Array("clamping_eng.htm","devices_eng.htm","clamping_eng.htm","devices_eng.htm");
a = Math.floor((ban_img.length - 1) * Math.random());
//a = 5;
url_uno = "<A HREF=\"" + ban_url[a] + "\" onMouseOver=\"MM_showHideLayers(\'banner2\',\'\',\'show\')\" onMouseOut=\"MM_showHideLayers(\'banner2\',\'\',\'hide\')\"><IMG SRC=\"img/" + ban_img[a] + "\" WIDTH=470 HEIGHT=62 BORDER=0></A>";
url_due = "<IMG SRC=\"img/" + ban_l_img[a] + "\" WIDTH=470 HEIGHT=215 BORDER=0>";