if (document.images) {
    homebuttonup       = new Image();
    homebuttonup.src   = "http://www.schoolheart.com/hclub/images/login.gif" ;
    homebuttonover     = new Image() ;
    homebuttonover.src = "http://www.schoolheart.com/hclub/images/loginover.gif" ;
    homebuttondown     = new Image() ;
    homebuttondown.src = "http://www.schoolheart.com/hclub/images/logindown.gif" ;

    buybuttonup       = new Image();
    buybuttonup.src   = "http://www.schoolheart.com/hclub/images/purchase.gif" ;
    buybuttonover     = new Image() ;
    buybuttonover.src = "http://www.schoolheart.com/hclub/images/purchaseover.gif" ;
    buybuttondown     = new Image() ;
    buybuttondown.src = "http://www.schoolheart.com/hclub/images/purchasedown.gif" ;
}
function buttonover( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "over.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}
function buttondown ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}