size = 100;

function adjustFontSize(status)
{
	if(status == 'up' && size < 150)
	{
		size = size + 25;
		document.getElementById('content').style.fontSize=size+'%';
	}
	else if(status == 'down' && size > 100)
	{
		size = size - 25;
		document.getElementById('content').style.fontSize=size+'%';
	}		
}