Ok, so you want the page layout to flow like newspaper columns?
CSS3 adds support for columns, but it is not supported by older browsers. If you don’t care about supporting browsers earlier than IE10, then you could experiment with this. For example: [url]http://www.w3schools.com/css/css3_multiple_columns.asp[/url]
Your other option would be to write some custom code that would split your checkbox options into one bucket for each column and use multiple checkbox group controls (one for each column). Then merge the selected items from each bucket back together when you need to get the complete set of selected checkboxes.
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