function mostraGrow( elemento ) {
	new Effect.Grow( elemento, {duration: 1.5} );
}
function escondeShrink( elemento ) {
	new Effect.Shrink( elemento, {duration: 1.5} );
}
function mostraAppear( elemento ) {
	new Effect.Appear( elemento, {duration: 1.5} );
}
function mostraBlindDown( elemento ) {
	new Effect.BlindDown( elemento, {duration: 1} );
}
function escondeBlindUp( elemento ) {
	new Effect.BlindUp( elemento, {duration: 1} );
}
function mostraSlideDown( elemento ) {
	new Effect.SlideDown( elemento, {duration: 1} );
}
function escondeSlideUp( elemento ) {
	new Effect.SlideUp( elemento, {duration: 1} );
}