<style type="text/css" >
#inp {
border:1px silver solid;
font:100 11px tahoma;
color:black;
background-color:white;
}
#inp :hover {
border:1px black solid;
font:100 11px tahoma;
color:white;
background-color:silver;
}
</style>
<input type="submit" name="submit" value="submit" id="inp" />
.request {
z-index: 1;
}
.request a {
display: block;
background: transparent url(img/btn.png) no-repeat 0 0;
color: #fff;
height: 28px;
line-height: 24px;
font-size: 13px;
width: 156px;
text-align: center;
cursor: pointer;
}
.request a:hover {
background: transparent url(img/.png) no-repeat 0 -28px;
}
<div class="request">
<p><a href="index.php" target="_parent">صفحه اصلی</a></p>
</div>