In following the official doc : http://nicolasbize.github.io/magicsuggest/#tab-4
The author initialize with :
$('#ms-right').magicSuggest({
width: 250,
selectionPosition: 'right',
data: 'red,orange,blue,purple,dark blue,yellow,green,magenta,cyan,black,white'
});
So to focus on the input :
$('#ms-right input').focus();
Tested with chrome v32.0.1700.107, it works...