ActionScript Bytes

Consulted the tutorial from Erin's Flash lite blog. Adjusted the script.
Now, the object can move "Left", "Right", "Up", "Down".

And I find out used case 1 instead of case 2, the ActionScript Bytes is reduced.
( for my project, it reduced from 788bytes to 773bytes )

case 1
if ( ) {
}
if ( ) {
}
if ( ) {
}
if ( ) {
}

case 2
if ( ) {
}
else if ( ) {
}
else if ( ) {
}
else if ( ) {
}