// 判断浏览器类型
	var browserName = navigator.userAgent.toLowerCase();
	var mybrowser = {
		version : (browserName.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [0,
				'0'])[1],
		safari : /webkit/i.test(browserName) && !this.chrome,
		opera : /opera/i.test(browserName),
		firefox : /firefox/i.test(browserName),
		msie : /msie/i.test(browserName) && !/opera/.test(browserName),
		mozilla : /mozilla/i.test(browserName)
				&& !/(compatible|webkit)/.test(browserName) && !this.chrome,
		chrome : /chrome/i.test(browserName) && /webkit/i.test(browserName)
				&& /mozilla/i.test(browserName)
	}

$(this).css("top", mybrowser.msie ? "-2px" : "-3px").children("img")
				.eq(0).css({
							"cursor" : "pointer",
							"position" : "relative",
							"top" : mybrowser.msie ? "-2px" : "-3px"
						});