var is = new Array() ;
var il = new Array() ;

function mv( opt ) {
  mm( opt, 1 ) ;
}
function mo( opt ) {
  mm( opt, 0 ) ;
}
function mm( opt, state ) {
  document.images[ 'menu-' + opt ].src = is[ ( opt - 1 ) * 2 + state ] ;
}

for ( var x = 1 ; x <= 5 ; x++ ) {
  is[ is.length ] = 'images/menu-' + x + '-off.jpg' ;
  is[ is.length ] = 'images/menu-' + x + '-on.jpg' ;
}
for ( var ic = 0 ; ic < is.length ; ic++ ) {
  il[ ic ] = new Image() ;
  il[ ic ].src = is[ ic ] ;
}