handlePrevButtonState = function(type, args) 
{
		var enabling = args[0];
		var leftImage = args[1];
		if(enabling) {
			leftImage.parentNode.className = 'btn_a';
		} else {
			leftImage.parentNode.className = 'btn_p';	
		}
}

handleNextButtonState = function(type, args) 
{
		var enabling = args[0];
		var rightImage = args[1];

		if(enabling) {
			rightImage.parentNode.className = 'btn_a';
		} else {
			rightImage.parentNode.className = 'btn_p';
		}
}