/*
 * 
 * ImageScroller - a Image Horizental Scroll Viewer 
 * Version 0.1
 * @requires jQuery v1.2.1
 * 
 * Copyright (c) 2007 Luan
 * Email verycss-ok@yahoo.com.cn 
 * 
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *    
*/

jQuery.fn.imageScroller_head = function(params){
	var p = params || {
		next:"buttonNext",
		prev:"buttonPrev",
		frame:"viewerFrame_head",
		width:618,
		child:"a",
		auto:true
	}; 
	var _appImgPath = 'http://www.youthpreneur.net/interface_img/';
    var _btnNext = $("#"+ p.next);
	var _btnPrev = $("#"+ p.prev);
	_btnPrev.html('<img id="buttonPrev" src="'+_appImgPath+'prevlabel.png" />');
	_btnNext.html('<img id="buttonNext" src="'+_appImgPath+'nextlabel.png" />');
	var _imgFrame = $("#"+ p.frame);
	var _width = p.width;
	var _child = p.child;
	var _auto = p.auto;
	var _itv;
	
	var turnLeft = function(){
		_btnPrev.unbind("click",turnLeft);
		if(_auto) autoStop();
		_imgFrame.animate( {opacity:"toggle",marginLeft:-_width}, 'slow', 'jswing', function(){
			_imgFrame.find(_child+":first").appendTo( _imgFrame );
			_imgFrame.css("marginLeft",0);
			_btnPrev.bind("click",turnLeft);
			if(_auto) autoPlay();
		}).animate( {opacity: "toggle"}, 'slow', 'jswing');
	};
	
	var turnRight = function(){
		_btnNext.unbind("click",turnRight);
		if(_auto) autoStop();
		_imgFrame.find(_child+":last").clone().show().prependTo( _imgFrame );
		_imgFrame.css("marginLeft",-_width);
		_imgFrame.animate( {opacity:"toggle",marginLeft:0}, 'slow' ,'jswing', function(){
			_imgFrame.find(_child+":last").remove();
			_btnNext.bind("click",turnRight);
			if(_auto) autoPlay(); 
		}).animate( {opacity: "toggle"}, 'slow', 'jswing');
	};
	
	_btnNext.css("cursor","hand").click( turnRight );
	_btnPrev.css("cursor","hand").click( turnLeft );
	
	var autoPlay = function(){
	  _itv = window.setInterval(turnRight, 8000);
	};
	var autoStop = function(){
		window.clearInterval(_itv);
	};
	if(_auto)	autoPlay();
};