if (document.images) {
    solarbuttonup       = new Image();
    solarbuttonup.src   = "images/links/solarsite_roll.gif" ;
    solarbuttondown     = new Image() ;
    solarbuttondown.src = "images/links/solarsite.gif" ;

    trinitybuttonup       = new Image();
    trinitybuttonup.src   = "images/links/trinity_roll.gif" ;
    trinitybuttondown     = new Image() ;
    trinitybuttondown.src = "images/links/trinity.gif" ;

    laloganesbuttonup       = new Image();
    laloganesbuttonup.src   = "images/links/laloganes_roll.gif" ;
    laloganesbuttondown     = new Image() ;
    laloganesbuttondown.src = "images/links/laloganes.gif" ;

    templebuttonup       = new Image();
    templebuttonup.src   = "images/links/temple_roll.gif" ;
    templebuttondown     = new Image() ;
    templebuttondown.src = "images/links/temple.gif" ;

    breakdownbuttonup       = new Image();
    breakdownbuttonup.src   = "images/links/breakdown_roll.gif" ;
    breakdownbuttondown     = new Image() ;
    breakdownbuttondown.src = "images/links/breakdown.gif" ;

    milkywaybuttonup       = new Image();
    milkywaybuttonup.src   = "images/links/milkyway_roll.gif" ;
    milkywaybuttondown     = new Image() ;
    milkywaybuttondown.src = "images/links/milkyway.gif" ;

    hellibuttonup       = new Image();
    hellibuttonup.src   = "images/links/3dhelli_roll.gif" ;
    hellibuttondown     = new Image() ;
    hellibuttondown.src = "images/links/3dhelli.gif" ;

    notesbuttonup       = new Image();
    notesbuttonup.src   = "images/links/notes_roll.gif" ;
    notesbuttondown     = new Image() ;
    notesbuttondown.src = "images/links/notes.gif" ;

    breakdownRbuttonup       = new Image();
    breakdownRbuttonup.src   = "images/links/breakdown_R_roll.gif" ;
    breakdownRbuttondown     = new Image() ;
    breakdownRbuttondown.src = "images/links/breakdown_R.gif" ;

    milkywayRbuttonup       = new Image();
    milkywayRbuttonup.src   = "images/links/milkyway_R_roll.gif" ;
    milkywayRbuttondown     = new Image() ;
    milkywayRbuttondown.src = "images/links/milkyway_R.gif" ;

    helliRbuttonup       = new Image();
    helliRbuttonup.src   = "images/links/3dhelli_R_roll.gif" ;
    helliRbuttondown     = new Image() ;
    helliRbuttondown.src = "images/links/3dhelli_R.gif" ;

    notesRbuttonup       = new Image();
    notesRbuttonup.src   = "images/links/notes_R_roll.gif" ;
    notesRbuttondown     = new Image() ;
    notesRbuttondown.src = "images/links/notes_R.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" );
    }
}