if (document.images) {
    m1up       = new Image();
    m1up.src   = "gfx/m1.gif" ;
    m1down     = new Image() ;
    m1down.src = "gfx/m1on.gif" ;
    
    m2up       = new Image();
    m2up.src   = "gfx/m2.gif" ;
    m2down     = new Image() ;
    m2down.src = "gfx/m2on.gif" ;

    m3up       = new Image();
    m3up.src   = "gfx/m3.gif" ;
    m3down     = new Image() ;
    m3down.src = "gfx/m3on.gif" ;

    m4up       = new Image();
    m4up.src   = "gfx/m4.gif" ;
    m4down     = new Image() ;
    m4down.src = "gfx/m4on.gif" ;

    m5up       = new Image();
    m5up.src   = "gfx/m5.gif" ;
    m5down     = new Image() ;
    m5down.src = "gfx/m5on.gif" ;

   
}

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" );
    }
}