function switchState (element, previousClass, isHover)
	{
		var x = document.getElementById (element)
		
		if (isHover)
			x.className = 'hover';
		else
			x.className = previousClass;
	}
	
	function setFocus(e)
	{
		var x = document.getElementById (e)
		
		if (x)
			x.focus();
	}
	function  changeCssClass (e, className)
	{
		if (e)
			e.className = className;
	}