if (document.images) {
 home_out = new Image(); home_out.src="/img/mm/home.png"; 
 home_sel  = new Image(); home_sel.src  ="/img/mm/home-sel.png"; 

 manual_out = new Image(); manual_out.src="/img/mm/manual.png"; 
 manual_sel  = new Image(); manual_sel.src  ="/img/mm/manual-sel.png"; 
 
 myaccount_out = new Image();  myaccount_out.src="/img/mm/my-account.png"; 
 myaccount_sel  = new Image(); myaccount_sel.src  ="/img/mm/my-account-sel.png"; 
 
 register_out = new Image(); register_out.src="/img/mm/register.png"; 
 register_sel  = new Image(); register_sel.src  ="/img/mm/register-sel.png"; 

 faq_out = new Image(); faq_out.src="/img/mm/faq.png"; 
 faq_sel  = new Image(); faq_sel.src  ="/img/mm/faq-sel.png"; 

 contact_out = new Image(); contact_out.src="/img/mm/contact.png"; 
 contact_sel  = new Image(); contact_sel.src  ="/img/mm/contact-sel.png"; 

 forum_out = new Image(); forum_out.src="/img/mm/forum.png"; 
 forum_sel  = new Image(); forum_sel.src  ="/img/mm/forum-sel.png"; 

}

function NButton(btName) {
 if (document.images)
  eval('document.'+btName+'.src='+btName+'_out.src');
}

function OButton(btName) {
 if (document.images)
  eval('document.'+btName+'.src='+btName+'_sel.src');
}