function on1() 
{if (!document.images) return; document.a.src = "/images/butt_home_sel.jpg";} 
function on2() 
{if (!document.images) return; document.b.src = "/images/butt_design_sel.jpg";}
function on3() 
{if (!document.images) return; document.c.src = "/images/butt_development_sel.jpg";}
function on4() 
{if (!document.images) return; document.d.src = "/images/butt_contact_sel.jpg";}
function on5() 
{if (!document.images) return; document.e.src = "/images/butt_leggi_sel.jpg";}
function on6() 
{if (!document.images) return; document.f.src = "/images/butt_contatto_sel.jpg";}
function on7() 
{if (!document.images) return; document.g.src = "/images/butt_links_sel.jpg";}


function off1() 
{if (!document.images) return; document.a.src = "/images/butt_home.jpg";}
function off2() 
{if (!document.images) return; document.b.src = "/images/butt_design.jpg";}
function off3() 
{if (!document.images) return; document.c.src = "/images/butt_development.jpg";}
function off4() 
{if (!document.images) return; document.d.src = "/images/butt_contact.jpg";}
function off5() 
{if (!document.images) return; document.e.src = "/images/butt_leggi.jpg";}
function off6() 
{if (!document.images) return; document.f.src = "/images/butt_contatto.jpg";}
function off7() 
{if (!document.images) return; document.g.src = "/images/butt_links.jpg";}

var imgslist = new Array(
"/images/butt_home_sel.jpg",
"/images/butt_design_sel.jpg",
"/images/butt_development_sel.jpg",
"/images/butt_contact_sel.jpg"); 

var imgs=new Array(); 
for (x=0; x<imgslist.length; x++) 
 if (document.images) 
  {imgs[x]=new Image(); imgs[x].src = imgslist[x];}