if (document.images) {


		homeup       = new Image();
		homeup.src   = "graphics/home_button.png" ;
		homedown     = new Image() ;
		homedown.src = "graphics/home_button_hover.png" ;
		
		
		aboutup       = new Image();
		aboutup.src   = "graphics/about-_us_button.png" ;
		aboutdown     = new Image() ;
		aboutdown.src = "graphics/about-_us_button_hover.png" ;
		
		
		cartsup       = new Image();
		cartsup.src   = "graphics/carts_button.png" ;
		cartsdown     = new Image() ;
		cartsdown.src = "graphics/carts_button_hover.png" ;
		
		
		
		carportup       = new Image();
		carportup.src   = "graphics/car_ports_button.png" ;
		carportdown     = new Image() ;
		carportdown.src = "graphics/car_ports_button_hover.png" ;
		
		
		trailorsup       = new Image();
		trailorsup.src   = "graphics/trailors_button.png" ;
		trailorsdown     = new Image() ;
		trailorsdown.src = "graphics/trailors_button_hover.png" ;
		
		partrepairup       = new Image();
		partrepairup.src   = "graphics/part_repair_button.png" ;
		partrepairdown     = new Image() ;
		partrepairdown.src = "graphics/part_repair_button_hover.png" ;
		
		
		contact_buttonup       = new Image();
		contact_buttonup.src   = "graphics/contact_button.png" ;
		contact_buttondown     = new Image() ;
		contact_buttondown.src = "graphics/contact_button_hover.png" ;


}
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" );
    }
}