.policy img {
 width: 174px;
 height: 30px;
 border: none;
}

.policy {
 display:block;
 background-image : url(image/policy_bana1.gif); 
}

A:HOVER.policy {
 background-image : url(image/policy_bana2.gif);
}

.outline img {
 width: 174px;
 height: 30px;
 border: none;
}

.outline {
 display:block;
 background-image : url(image/outline_bana1.gif); 
}

A:HOVER.outline {
 background-image : url(image/outline_bana2.gif);
}

.feature img {
 width: 174px;
 height: 30px;
 border: none;
}

.feature {
 display:block;
 background-image : url(image/feature_bana1.gif); 
}

A:HOVER.feature {
 background-image : url(image/feature_bana2.gif);
}

.access img {
 width: 174px;
 height: 30px;
 border: none;
}

.access {
 display:block;
 background-image : url(image/access_bana1.gif); 
}

A:HOVER.access {
 background-image : url(image/access_bana2.gif);
}

.blog img {
 width: 174px;
 height: 30px;
 border: none;
}

.blog {
 display:block;
 background-image : url(image/blog_bana1.gif); 
}

A:HOVER.blog {
 background-image : url(image/blog_bana2.gif);
}