Dialog Framework With SharePoint 2010

 <CustomAction
  Id="DialogDemo"
  RegistrationType="List"
  RegistrationId="101"
  Location="CommandUI.Ribbon">
    <CommandUIExtension>
      <CommandUIDefinitions>
        <CommandUIDefinition
         Location="Ribbon.Documents.New.Controls._children">
          <Button
           Id="Ribbon.Documents.New.Controls.Demo_Dialog"
           Alt="Dialog Ribbon Button"
           Sequence="30"
           Image32by32="/_layouts/images/PPEOPLE.GIF"
           Command="Demo_Dialog"
           LabelText="Dialog Demo"
           TemplateAlias="o2"/>
        </CommandUIDefinition>
      </CommandUIDefinitions>
      <CommandUIHandlers>
        <CommandUIHandler
         Command="Demo_Dialog"
         CommandAction="javascript:
             var options = SP.UI.$create_DialogOptions();
             options.url = 'http://shalvin/Shalvin/Lists/Contacts/AllItems.aspx';
             options.width = 800;
             options.height = 600;
             SP.UI.ModalDialog.showModalDialog(options);"/>
      </CommandUIHandlers>
    </CommandUIExtension>
  </CustomAction>