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';	newcat.style.float='left';	

			lastCat=catID;

	}

}