侧栏广告 跟随浏览器移动(扩展)

(function($) {
    $.fn.fixedSidebar = function(options) {
        var defaults = {
            width: 100,
            height: 20,
			horizontalType: 'left', /*left,right*/
			horizontalValue:20,
			verticalType:'top', /*top,bottom*/
			verticalValue:30,
			berth:'browser',  /*browser,wrap*/
			wrapWidth:960,
			isHide:false,    
			scrollTop:120,
			content:''
        };

        var opts = $.extend(defaults, options);

        var floatBlock = 'floatBlock_' + Math.round(Math.random() * 10000);
		
        var positiontype = 'undefined' == typeof(document.body.style.maxHeight) ? "absolute" : "fixed";

        if (opts.horizontalType != 'left' && opts.horizontalType != 'right') {
            opts.horizontalType = 'left';
        }
		if (opts.verticalType != 'top' && opts.verticalType != 'bottom') {
            opts.verticalType = 'top';
        }
		var horizontalValue=0;
		var verticalValue=0;
		
		setHorizontalValue();
		setVerticalValue();
		
        $("body").append('<div id="' + floatBlock + '" style="width:'+opts.width+'px;height:'+opts.height+'px;position:' + positiontype + ';top:' + verticalValue + 'px;' + opts.horizontalType + ':' + horizontalValue + 'px;z-index:999;overflow:hidden;">'+opts.content+'</div>');
		
		if(opts.isHide) { $("#" + floatBlock + "").hide(); }
		
		$(window).scroll(function() {
			if ('undefined' == typeof(document.body.style.maxHeight)) {
				setVerticalValue();
					$("#" + floatBlock + "").css('top', verticalValue + "px");
			}
			if(opts.isHide)
			{
				if($(window).scrollTop()>opts.scrollTop) 
					{ $("#" + floatBlock + "").slideDown(); }
				else 
					{ $("#" + floatBlock + "").slideUp(); }
			}
		})
		
        $(window).resize(function() {
			setHorizontalValue();
			$("#" + floatBlock + "").css(opts.horizontalType, horizontalValue + "px");
			setVerticalValue();
			$("#" + floatBlock + "").css('top', verticalValue + "px");
        })
		
		function setHorizontalValue()
		{ 
			horizontalValue = opts.berth == 'wrap' ? ($(window).width()-opts.wrapWidth)/2-opts.width-opts.horizontalValue : opts.horizontalValue; 
		}
		
		function setVerticalValue()
		{
			if ('undefined' == typeof(document.body.style.maxHeight)) {
				verticalValue = opts.verticalType == 'top' ? $(window).scrollTop()+opts.verticalValue : $(window).scrollTop()+$(window).height()-opts.verticalValue;
			}
			else
			{
				verticalValue = opts.verticalType == 'top' ? opts.verticalValue : $(window).height()-opts.verticalValue;
			}
		}
    };
})(jQuery)