I'm using a php web script with a Log In Box

I had someone redesign/recode the Log In Box, but the Submit button
didn't work. So I added back in the old submit button, however I'd like to use the newer button image for it. I just don't know how to code it correctly. The form that currently works is this one:

Code:
<form action="login.php" method="post" accept-charset="UTF-8" class="middletext">
<label><font class="font4_13">Username</font></label><span class="username"><input type="text" name="user_name_login" size="16" style="width:138px;" />
<label><font class="font4_13">Password</font></label><span class="password"><input type="password" name="password_login" size="16" style="width:138px;" /
<input type="submit" value="[var.lang_login_now]" class="" />
<input type="hidden" name="submitted" value="yes" />
<input type="hidden" name="remember_me" value="remember_me" />
</form>
The form that doesn't work is this one:
Code:
<form action="login.php" method="post" accept-charset="UTF-8" class="middletext">
<label><font class="font4_13">Username</font></label><span class="username"><input type="text" name="user_name_login" size="16" style="width:138px;" />
<label><font class="font4_13">Password</font></label><span class="password"><input type="password" name="password_login" size="16" style="width:138px;" />
<a class="btn_vid" href="login.php value="[var.lang_login_now]">--></a>
<input type="hidden" name="submitted" value="yes" />
<input type="hidden" name="remember_me" value="remember_me" />
</form>
How can integrate the "btn_vid" image into the first form above so that the log in form works with the new image?

Thanks