var currentTitleNumber = 0;

function pageUpDiv(size)
{	 
	var hideobj;
	
	hideobj = document.getElementById("title"+currentTitleNumber);
	hideobj.style.display="none";
	
	if (currentTitleNumber == (size-1))
	{
		currentTitleNumber = 0;
	}
	else
	{
		currentTitleNumber++;
	}
	
	var showobj = document.getElementById("title"+currentTitleNumber);

	showobj.style.display = 'block';		
}

function pageDownDiv(size)
{	 
	var hideobj;
	
	hideobj = document.getElementById("title"+currentTitleNumber);
	hideobj.style.display="none";
	
	if (currentTitleNumber == 0)
	{
		currentTitleNumber = size-1;
	}
	else
	{
		currentTitleNumber--;
	}
	
	var showobj = document.getElementById("title"+currentTitleNumber);

	showobj.style.display = 'block';		
}