$(document).ready(function() {
	$('.header').cycle({
		fx: 'fade'
	});
});

function check_quantity() {
	var quantity = document.getElementById('quantity').value;
	quantity = trimWhiteSpace(quantity);
	
	return_value = checkWhiteSpace(quantity);
	
	if (return_value != false)
	{
		if (isNaN(quantity))
		{
			alert("Please enter a valid quantity.");
			return false;
		}
		
		var quantity_int = parseInt(quantity);
		
		if (quantity_int != quantity)
		{
			alert("Please enter a valid quantity.");
			return false;
		}
	}
	
	return return_value;
}

function trimWhiteSpace(s) { 
	s.replace(/^\s*/, '').replace(/\s*$/, ''); 

   return s;
} 

function checkWhiteSpace(s) 
{
	 white_space_test = new RegExp(/^\s+$/);

	 if (white_space_test.test(s)) 
	 {
		  alert("Please enter a valid quantity.");
		  return false;
	 }
	 
	return true;
}