function insertBeforeAfter(class_name)
{
	var obj = document.getElementsByTagName('*');
	var target_class = " " + class_name + " ";
	var before, after;
	var curr_class_name = null;
	var curr_obj = null;
	for (var i = 0; i < obj.length; i++)
	{
		curr_obj = obj[i];
		curr_class_name = " " + curr_obj.className + " ";
		if (curr_class_name.indexOf(target_class) > -1)
		{
			before = document.createElement('span');
			before.className = 'before';
			after = document.createElement('span');
			after.className = 'after';
			
			curr_obj.insertBefore(before, curr_obj.firstChild);
			curr_obj.appendChild(after);
		}
	}
}