When attempting to open a popup window by clicking on an image button in an ASP.NET website, I encounter an issue where the popup window appears for just one second and then disappears. Interestingly, when using a certain tag, the popup window displays properly, but with another approach it vanishes. Is there something missing in the code that I am overlooking?
<div id="cover"></div>
<div id="dialog">
My Dialog Content
<br><input type="text">
<br><input type="button" value="Submit">
<br><a href="#" onclick="closePopUp('dialog');">[Close]</a>
</div>
<a href="#" onclick="showPopUp('dialog');">Show</a>
<asp:ImageButton ID="ImageButton3" runat="server" ImageUrl="~/slika/PLUS.gif" onClientClick="showPopUp('dialog');" />