To set the width of a jquery autocomplete combobox

You can use the javascript or css methods to set the width of jquery autocomplete combobox
If you want to use css, use this code

.ui-autocomplete-input { width:100px; }

or if you want to set this to a specific combobox use this css

.title .ui-autocomplete-input { width: 100px; }

If you want to use javascript try this code.

$('.ui-autocomplete-input').css("width", "100px");