Validation of Repeater using Javascript

I've a Repeater like,

<asp:Repeater ID="Virt" runat="server"> <ItemTemplate> <div>%#Eval("ID")%></div> <div ><b><%#Eval("tAmount")%></b></div> <div> <asp:TextBox ID="txtAmount" runat="server" onkeypress="return OnlyNumbers();" ></asp:TextBox> </div> <div class="clear"></div> </div> </ItemTemplate> </asp:Repeater>
Now, when user types any value in txtAmount I've to check if value if greater than tAmount from repeater using javascript.  How could I do this.?