<button type="submit" id="wlpeLoginButton" name="service" value="login"><img src="assets/images/login-btn.png" width:"15px" height:"15px" alt="Submit" /></button>
<button id="wlpeLoginButton" name="service" type="image" src="assets/images/login-btn.gif" value="login"></button>
<input type="Image" src="assets/images/login-btn.png" id="wlpeLoginButton" name="service" value="login" />