auto complete with checkbox

Hi,

I am trying to use the text_field_with_auto_complete but i need to extend it. So i want to have a scroll bar, so if the list becomes too long i have a vertical scroll bar. I tried giving my DIV some height but it is giving me horizontal scroll bar and not a vertical one.

Also i want auto complete but at the same time also have the ability to select multiple values from the auto complete list. So i think essentially this needs to be done by having a check box in the auto complete list.

Has anyone tried any of this.

Any help would be useful to me.

Neha