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Code:
#chcategories ul a {/*top categories*/
    display: list-item;
    list-style: disc inside url(../images/bullet1.gif);/*change to list-style: none; to remove bullet*/
    background: no-repeat;
    border: none;
    margin: 0;
    padding: 0;
    }

/*add this rule*/
#chcategories ul li.cat-top>a {display: none;}