How to use Suggestions API to build a custom Search in AFP

Hi,

I am creating a custom masthead from scratch using LSAPI. Need to add a search which would search for suggestions in the Portal Navigation, just like the standard search works in AFP

This is what I have tried so far

var filter = new (EPCM.getSAPTop()).SuggestionFilter();
filter.setNumSuggestions(22); 
filter.setSearchOption( EPCM.getSAPTop().SearchOption.contains ); 
filter.setCategories("Documents;Navigation"); 
EPCM.getSAPTop().LSAPI.suggestionPlugin.getSuggestions("My", suggestionCallback, filter); 
function suggestionCallback( searchTerm, suggestions )
{        if( !suggestions ) // no suggestions passed        {                return;        }        // Loop through the suggestions array and retrieves their data.        for(var i = 0 ; i < suggestions.length ; i++)        {                var suggestion = suggestions[i];                var url = suggestion.getURL();                 var title = suggestion.getTitle();                 var tooltip = suggestion.getTooltip();                 var navMode = suggestion.getNavMode();                 var categoryTitle = suggestion.getGroupTitle();                 var iconURL = suggestion.getIconURL();                var providerId = suggestion.getProviderId();        }
}

But it errors out - Uncaught TypeError: Cannot read property 'contains' of undefined(…)

Any pointers on how to fix this?

Thanks

Sandip