Modifying easy slider javascript for use with a button

JAVASCRIPT:
(function($) {
	$.fn.easySlider = function(options){	  
		// default configuration properties
		var defaults = {
			prevId: 		'prevBtn',
			prevText: 		'Previous',
			nextId: 		'nextBtn',	
			nextText: 		'Next',
			orientation:	'', //  'whatever' is optional;
			speed: 			200		
		}; 		
		var options = $.extend(defaults, options);  		
		return this.each(function() {  
			obj = $(this); 				
			var s = $("li", obj).length;
			var w = obj.width(); 
			var h = obj.height(); 
			var ts = s-1;
			var t = 0;
			var whatever = (options.orientation == 'whatever');
			$("ul", obj).css('height',s*w);			
			if(!whatever) $("li", obj).css('float','left');
			$(obj).after('<span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span> <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>');		
			$("a","#"+options.prevId).hide();
			$("a","#"+options.nextId).hide();
			$("a","#"+options.nextId).mouseover(function(){		
				animate("next");
				if (t>=ts) $(this).fadeOut();
				$("a","#"+options.prevId).fadeIn();
			});
			$("a","#"+options.prevId).mouseout(function(){		
				animate("prev");
				if (t<=0) $(this).fadeOut();
				$("a","#"+options.nextId).fadeIn();
			});	
			function animate(dir){
				if(dir == "next"){
					t = (t>=ts) ? ts : t+1;	
				} else {
					t = (t<=0) ? 0 : t-1;
				};								
				if(!whatever) {
					p = (t*h*-1);
					$("ul",obj).animate(
						{ marginTop: p }, 
						options.speed
					);				
				} else {
					p = (t*w*-1);
					$("ul",obj).animate(
						{ marginLeft: p }, 
						options.speed
					);					
				}
			};
			if(s>1) $("a","#"+options.nextId).fadeIn();	
		});	  
	};
})(jQuery);
 
CURRENT HTML:
<ul id="menu"> 
    <li><a href="index.html">Home</a></li>
    <li><a href="page2.html">Page 2</a></li>
    <li><a href="contact.html">Contact</a></li>
</ul>
 
CURRENT CSS:
#menu li{
	width: 120px;
	list-style: none;
	float: left;
	padding: 0px 2px;
	font-size:12px;
	display:inline-block;
}
	
/*#menu li a
{
	display: block;
	height:38px;
	line-height:28px;
	padding: 3px 0px 0px 0px;
	background:url(../images/BtnGreen120x38.png) no-repeat;
	text-align: center;
	text-decoration: none;
	color:white	
}
 
#menu li a:hover
{
	background:url(../images/BtnGreenHover120x38.png);
	font-weight:bold;
	letter-spacing: 0.2em;
	font-style: italic;
}

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