function showSummary(a,b) { 
	var longSummary = document.getElementById(a); // object to be hidden
	var shortSummary = document.getElementById(b); // object to be shown
	
	if(longSummary.style.display != 'none') {	
		longSummary.style.display = 'none';
		shortSummary.style.display = '';
	} else if(shortSummary.style.display != 'none') { 
		longSummary.style.display = '';
		shortSummary.style.display = 'none';
	}
}