rem: getAutocompleteMenu().hide(); hideShowCovered(); 
add: if ( document.getElementById(getMenuId()) ) { getAutocompleteMenu().hide(); hideShowCovered(); } 
context:     function hideAutoComplete(){        hidingAutocomplete=1;        visible=0;        selected=-1;        getAutocompleteMenu().hide();        hideShowCovered();    }
meta: 1204	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1204/75871bfd1b512f8de12c299b44208f8910cd16bf/wicket-autocomplete.js/clean/jdk-1.4/wicket-extensions/src/main/java/org/apache/wicket/extensions/ajax/markup/html/autocomplete/wicket-autocomplete.js