title: avoid page load on html image button click
body: <p>I have code on aspx page :</p>
  
  <pre><code>&lt;input id="imgBtnUpdate" type="image" src="../images/update_btn.gif" value="Update" onclick="javascript:showModalPopupUpdate();"/&gt;
  </code></pre>
  
  <p>also Script is :</p>
  
  <pre><code>var popUpObj11;
      function showModalPopupUpdate() {
  
          popUpObj11 = window.open("AddPopup.aspx?mode=Update",
          "ModalPopUp",
          "toolbar=no," +
          "scrollbars=no," +
          "location=no," +
          "statusbar=no," +
          "menubar=no," +
          "resizable=no," +
          "width=450," +
          "height=190," +
          "left = 490," +
          "top=300"
          );
          popUpObj11.focus();
      }
  </code></pre>
  
  <p>Ok? 
  When i clicking the imgBtnUpdate Button. it showing me popup which is fine. but why it reloading the parent page on which the button consisting ? please guide me... tell me solution.</p>