function on1() 
{if (!document.images) return; document.a.src = "images/dot_about_sel.gif";} 
function on2() 
{if (!document.images) return; document.b.src = "images/dot_catalog_sel.gif";}
function on3() 
{if (!document.images) return; document.c.src = "images/dot_services_sel.gif";}
function on4() 
{if (!document.images) return; document.d.src = "images/dot_support_sel.gif";}
function on5() 
{if (!document.images) return; document.e.src = "images/dot_contact_sel.gif";}
function on6() 
{if (!document.images) return; document.f.src = "images/dot_login_sel.gif";}
function on7() 
{if (!document.images) return; document.g.src = "images/dot_guests_sel.gif";}

function off1() 
{if (!document.images) return; document.a.src = "images/dot_about.gif";}
function off2() 
{if (!document.images) return; document.b.src = "images/dot_catalog.gif";}
function off3() 
{if (!document.images) return; document.c.src = "images/dot_services.gif";}
function off4() 
{if (!document.images) return; document.d.src = "images/dot_support.gif";}
function off5() 
{if (!document.images) return; document.e.src = "images/dot_contact.gif";}
function off6() 
{if (!document.images) return; document.f.src = "images/dot_login.gif";}
function off7() 
{if (!document.images) return; document.g.src = "images/dot_guests.gif";}