function ChangeCaption(N)
{
   var newdivid = "caption" + N; 

	 // hiding
	 document.getElementById('caption0').style.display = 'none';
	 
	 // showing
	 document.getElementById(newdivid).style.display = ''; 
  
}
	
function ShowDefault(M)
{
   var olddivid = "caption" + M;
	 	 
	 // hiding
	 document.getElementById(olddivid).style.display = 'none';

 	 // showing
	 document.getElementById('caption0').style.display = ''; 
}