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来源：http://www.dynamicdrive.com/dynamicindex17/ddaccordionmenu.htm
arrowgreen.gif是原版，
arrowblue.gif是后做的图片，配合以下样式使用：
.arrowsidemenu div a{ /*header bar links*/
background: transparent url(arrowblue.gif) 100% 0;
}
.arrowsidemenu ul li{
border-bottom: 1px solid #68b2e3;
}
.arrowsidemenu ul li a{
border-left: 10px double #68b2e3;
}
8a3c011b39
