// showPage.js
function showPage(pid, bid) {
	var totalNumberOfPages = 20;
	for( p = 1; p <= totalNumberOfPages; p++) {
		if(document.getElementById('page'+p))
		   document.getElementById('page'+p).style.display='none';
	}
	if(document.getElementById('page'+pid))
	   document.getElementById('page'+pid).style.display='block';
	var totalNumberOfButtons = 20;
	for( b = 1; b <= totalNumberOfButtons; b++) {
		if(document.getElementById('button'+b))
		   document.getElementById('button'+b).className='inactive';
	}
	if(document.getElementById('button'+bid))
	   document.getElementById('button'+bid).className='active';
}