$.fn.classifyLinks = function(options) {  
 	var settings = {
		'linkSelector'	: 'a',
		'parentSelctor' : 'li'
	};

	return this.each(function() {        
		if (options) { 
			$.extend( settings, options );
		}

		$(this).find(settings.linkSelector).each(function() {
			var link = $(this),
					linkText = link.text().toLowerCase(),
					className = linkText.split(' ').join('_'),
					className = className.split('-').join('_'),
					className = className.split('.').join('_'),
					linkParent = link.closest(settings.parentSelctor);

			linkParent.addClass(className);
		});
	
	});
};

$(document).ready(function() {
	$('#footer-navigation').classifyLinks();
});