c# LinkButton OnClientClick

I have a DropDownList box where the user can select the year they would like to copy.

Year: <asp:DropDownList ID="yrl" runat="server" OnSelectedIndexChanged="LoadHolidaysExceptions" AutoPostBack="true"></asp:DropDownList>

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I have a LinkButton and when the user clicks it I first need to check if they want to continue.  I use the following:

<asp:LinkButton ID="CopyHolidayLink" class="cssCopy" onClick="CopyHoliday" OnClientClick="return confirm('Coping holidays will replace all holidays next year with entries from the year selected.'); " runat="server">Copy Holidays to Next Year</asp:LinkButton>

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If they confirm 'Yes' then the 'CopyHoliday' code is run.  On the OnClientClick I would like to take the year they selected in the dropdownlist and add that year to the wording in the LinkButton but I don't know how.  Something like this:

OnClientClick="return confirm('Coping holidays will replace all holidays next year with entries from the year ' + Request["yrl"] + '.'); " 

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Any ideas?