var lastCat='';function getObject(ID,Silent){Silent=(typeof Silent=='undefined'?false:Silent);var object;if(document.getElementById){object=document.getElementById(ID);}
else if(document.all){object=document.all[ID];}
else if(document.layers){object=document.layers[ID];}
else{if(!Silent){alert('Cannot access object: '+ID);}
return null;}
if(object==null){if(!Silent){alert('Object not found: '+ID);}}
return object;}
function showCat(catID){var newcat=getObject(catID,true);if(newcat==null){return;}
if(lastCat!=''){var opencat=getObject(lastCat,true);if(opencat!=null){opencat.style.display='none';}}
if(lastCat==catID){lastCat='';}
else{newcat.style.display='block';lastCat=catID;}}