IF判断2个及以上ID
<%if(category_id==ID1||category_id==ID2)%> 或者<%if(category_id>=ID1&&category_id<=ID2)%>

两种样式判断语句：
<%if(category_id==ID)%>
.....................
<%else if(category_id==ID)%>
........................
<%else%>
........................
<%/if%>