CSS:
input.potrebitel {
background: #fff url(potrebitel.jpg) no-repeat; padding-left: 15px;
}
input.parola {
background: #fffurl(parola.jpg) no-repeat; padding-left: 15px;
}
HTML:
<input name="user" class="potrebitel" type="text" value="vyvdei user" />
<input name="pass" class="parola" type="password" value="vyvedi parola" />