how enable to click next part number ?

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C#

ASP.NET

Javascript

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you can see my image using this link : http://tinypic.com/view.php?pic=2dkwxhs&s=5#.Us4u1vQW0Xt
hello,

while clicking i showing image and parts number 1,2,3 and so forth. you can see that image as saving the above image. everything works fine. but if i click one part number , i have to close that pop up window to click next part number. but i need when you click next part number the preveous(which is poped up) should close and recently clicked part window should open.

here i put coding.

I, aspx.cs page:

Datatable dt = (DataTable)Session["parts"];
  
 CircleHotSpot h = new CircleHotSpot();
 h.X = Convert.ToInt32(dt.Rows[i]["xpos"]);
 h.Y = Convert.ToInt32(dt.Rows[i]["ypos"]);
 h.X = convertxypos(h.X);
 h.Y = convertxypos(h.Y);
  
 h.Radius = 10;
  
 h.NavigateUrl="javascript:funname("+dt.Rows.[i]["partnumber"].ToString()+")";

II, aspx page.

<script type="txt/Javascript">
  
 function funname(partno){
  
 document.getElementById('<%=lblf12.ClientID%>').innerHTML = partno;
  
 var mod = $find("mypartid"); // this part number 1,2,3,...comes
 if (mod != null) {
 document.getElementById('<%=Pan1.ClientID%>').style.visibility = "visible";
 mod.set_X(gx + 5);
 mod.set_Y(gy);
 mod.show();
  
 }
  
 }
  
 </script>
  
 <ajaxtoolkit:ModalPopupExtender ID="Modpop1" BehaviorID="mypartid"  runat="server"
 TargetControlID="imcl" PopupControlID="Pan1" CacheDynamicResults="true" // imcl is the id of image close button 'X'
 DropShadow="true" CancelControlID="imcl">
 </ajaxtoolkit:ModalPopupExtender>
  
 <ajaxtoolkit:RoundedCornersExtender Corners="All" Radius="6"  runat="server" ID="pop_round" TargetControlID="Pan1" ></ajaxtoolkit:RoundedCornersExtender>
  
 <asp:Panel ID="Pan1" Width="300" runat="server" >
  
 <table style=" width:100%; height:47px; color: #FFFFFF;">
  
 <tr><td>
  
 <asp:ImageButton ID="imcl" runat="server" ImageUrl="~/Im/clo1.gif" Width="28" Height="25" /> //this close image 'X' which is showing in image.
  
 </td></tr></table>
  
 <table><tr>
 <td><asp:Label ID="labf1" runat="server" Text="part number" Font-Names="Sans-Serif" Font-Size="12px"></asp:Label>      :
 <asp:Label ID="lblf12" runat="server" Font-Names="Sans-Serif" Font-Size="12px" "></asp:Label></td></tr></table>
  
 </asp:Panel>

Help needed.