function addHover()
{
	var nav = document.getElementById('nav');
	nav.className='hover';
}

function undoHover()
{
	var nav = document.getElementById('nav');
	nav.className='';
}

function addFilterHover(filterName)
{
	var filter = document.getElementById(filterName);
	filter.className='hover';
}

function undoFilterHover(filterName)
{
	var filter = document.getElementById(filterName);
	filter.className='';
}

function changeActive(id)
{
	var getCurrentActive = getElementsByClassName('activeFilter');
	var currentActive =  document.getElementById(getCurrentActive);
	currentActive.className='';
	var newActive =  document.getElementById(id);
	newActive.className = 'activeFilter'
}

function getElementsByClassName(classname, node)
{
    if(!node) node = document.getElementsByTagName("body")[0];
    var id = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++)
        if(re.test(els[i].className))id.push(els[i].id);
    return id;
}

function clearSearch()
{
	var search = document.getElementById('s');
	if (search.value == 'Search')
	{
		search.value='';
	}
}

function decreaseFontSize()
{
  var body =document.getElementById("body");
  document.body.style.fontSize='14px';
}

function normalFontSize()
{
  var body =document.getElementById("body");
  document.body.style.fontSize='16px';
}

function increaseFontSize()
{
  var body =document.getElementById("body");
  document.body.style.fontSize='19px';
}