//图片滚动  


//图片无缝滚动
$.fn.imgscroll = function(o){
	var defaults = {
		speed: 40,
		amount: 0,
		width: 1,
		dir: "left"
	};
	o = $.extend(defaults, o);
	
	return this.each(function(){
		var _li = $("li", this);
		_li.parent().parent().css({overflow: "hidden", position: "relative"}); //div
		_li.parent().css({margin: "0", padding: "0", overflow: "hidden", position: "relative", "list-style": "none"}); //ul
		_li.css({position: "relative", overflow: "hidden"}); //li
		if(o.dir == "left") _li.css({float: "left"});
		
		//初始大小
		var _li_size = 0;
		for(var i=0; i<_li.size(); i++)
			_li_size += o.dir == "left" ? _li.eq(i).outerWidth(true) : _li.eq(i).outerHeight(true);
		
		//循环所需要的元素
		if(o.dir == "left") _li.parent().css({width: (_li_size*3)+"px"});
		_li.parent().empty().append(_li.clone()).append(_li.clone()).append(_li.clone());
		_li = $("li", this);

		//滚动
		var _li_scroll = 0;
		function goto(){
			_li_scroll += o.width;
			if(_li_scroll > _li_size)
			{
				_li_scroll = 0;
				_li.parent().css(o.dir == "left" ? { left : -_li_scroll } : { top : -_li_scroll });
				_li_scroll += o.width;
			}
				_li.parent().animate(o.dir == "left" ? { left : -_li_scroll } : { top : -_li_scroll }, o.amount);
		}
		
		//开始
		var move = setInterval(function(){ goto(); }, o.speed);
		_li.parent().hover(function(){
			clearInterval(move);
		},function(){
			clearInterval(move);
			move = setInterval(function(){ goto(); }, o.speed);
		});
	});
};

//图片自适应宽度
    function setImgMiddle(img) {  
        var $img = $(img),  
            $panel = $(img).parent();//图片容器  
  
        var img_width = $img.width(),img_height = $img.height(),//图片宽高  
            panel_width = $panel.width(), panel_height = $panel.height(); //图片容器宽高  
  
        if(panel_width/panel_height < img_width/img_height){  
            $img.width(panel_width);  
            $img.css('margin-top', (panel_height - $img.height()) * 0.5);  
        }else{  
            $img.height(panel_height);  
            $img.css('margin-left', (panel_width - $img.width()) * 0.5);  
        }  
        $img.fadeIn(100);  
    }  

    function checkForm()
{
	var flag = true;
	$('#guestbook').find('input[required="required"]').each(function() {
		var obj = $(this);
		if($.trim(obj.val()) == '')
		{
			var label = obj.parent().parent().parent().find('.message_title').text().replace(/：/, '');
			label = label.replace('*','');
			var str = '请填写' + label + '！';
			alert(str);
			obj.focus();
			flag = false;
			return false;
		}
	});
	if(flag == true)
	{
		$('#form').submit();
	}
}