function ChuanZhi(zhi) {
var bian = document.getElementById("bian").value;
if (bian.toString() == "") {
bian = zhi;
}
document.getElementById(bian).style.backgroundColor = "#66CCFF";
document.getElementById(bian).style.color = "#000000";
document.getElementById("FuZhi").value = zhi;
document.getElementById("bian").value = zhi;
document.getElementById(zhi).style.backgroundColor = "#0066CC";
document.getElementById(zhi).style.color = "#FFFFFF";
}
<asp:DataList ID="DataList1" runat="server" RepeatDirection="Horizontal"
RepeatColumns="7" Height="31px">
<ItemTemplate>
<div id="<%#Eval("id") %>" onclick="ChuanZhi(<%#Eval("id") %>)" style="width: 80px;
height: 30px; line-height:30px; text-align: center; background-color: #66CCFF">
<%#Eval("ZhongWenMing")%>
</div>
</ItemTemplate>
</asp:DataList>
<input type="hidden" id="bian" />
<input type="hidden" id="zhoushu" />