if (document.images)
{

	button_home_up       = new Image();
	button_home_up.src   = "images/button_home.jpg" ;
	button_home_down     = new Image() ;
	button_home_down.src = "images/button_home_over.jpg" ;

	button_screens_up       = new Image();
	button_screens_up.src   = "images/button_screens.jpg" ;
	button_screens_down     = new Image() ;
	button_screens_down.src = "images/button_screens_over.jpg" ;

	button_lattice_up       = new Image();
	button_lattice_up.src   = "images/button_lattice.jpg" ;
	button_lattice_down     = new Image() ;
	button_lattice_down.src = "images/button_lattice_over.jpg" ;

	button_products_up       = new Image();
	button_products_up.src   = "images/button_products.jpg" ;
	button_products_down     = new Image() ;
	button_products_down.src = "images/button_products_over.jpg" ;

	button_links_up       = new Image();
	button_links_up.src   = "images/button_links.jpg" ;
	button_links_down     = new Image() ;
	button_links_down.src = "images/button_links_over.jpg" ;

	button_contact_up       = new Image();
	button_contact_up.src   = "images/button_contactus.jpg" ;
	button_contact_down     = new Image() ;
	button_contact_down.src = "images/button_contactus_over.jpg" ;

	button_about_up       = new Image();
	button_about_up.src   = "images/button_aboutus.jpg" ;
	button_about_down     = new Image() ;
	button_about_down.src = "images/button_aboutus_over.jpg" ;
}



function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}

function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}