make whole image a link in dreamweaver

I have made some images into links by putting the web address onto the link field in Dreamweaver, which should be really straight forward... It looks like this in the code

<div id="fb"> 
     <a href="http://www.facebook.com">
          <img src="graphics/social graphics/facebook.gif" width="31" height="31" alt="Facebook Logo" />
     </a>
</div>

But when I preview in browser the whole image does not turn into a link, only the bottom part of it does. So when I hover my mouse over the image, only at the very bottom of the image it turns into a hand. Any ideas on why this is happening would be mu开发者_开发知识库ch appreciated! Thank you!

@charset "UTF-8";
* {
        margin: 0px;
        padding: 0px;
}


body {
  margin:0 auto;
  width:800px;
  padding-top:10px;

}



#imagerow #studioimage4 {
    float: left;
}
#main #imagerow div a #Todo1 {
    float: left;
}
#social div {
    width: 100px;
    float: left;
}
#container #main #mainimage #rotxt a #studioimage4 {
    float: left;
}

#container {
    font-family: Georgia, "Times New Roman", Times, serif;
    text-align: left;
    color: #663300;
    width: 800px;
}
#container #main #imgcontainer #social #tripadvisor {
    width: 80px;
}
#footer #social #email .st_email_large {
}
#footer #social #email {
}
#container #main #imgcontainer #social {
    padding-top: 165px;
}
#nav-menu {
    padding-right: 65px;
    padding-left: 65px;
}
#main p {
    font-size: 0.9em;
    font-family: Georgia, "Times New Roman", Times, serif;
    padding-left: 1px;
}
#googlemap {
    margin-bottom: -15px;
}
#reservations {
    margin-top: -2em;
    margin-bottom: -2em;
}
#main img {
    float: right;
    font-family: Georgia, "Times New Roman", Times, serif;
}
#container #main h1 {
    font-size: 1em;
}
#header {
    background: url(graphics/header.jpg) no-repeat;
    height: 148px;
    font-family: Georgia, "Times New Roman", Times, serif;
}
#navbanner {
    height: 38px;
    background: #f09911;
    margin-top: 5px;
    margin-bottom: 20px;
}
#nav-menu ul
{
list-style: none;
padding: 0;
margin: 0;
}
#nav-menu li
{
    float: left;
    font-size: 0.9em;
    margin-left: 0px;
    margin-bottom: 0;
    padding: 0px 5px;
    list-style: none;
    display: inline;
}
#nav-menu li a
{
    line-height: 2.3em;
    float: left;
    width: 120px;
    color: #663300;
    font-weight: bold;
    text-decoration: none;
    text-align: center;
    padding-top: 2px;
}
#nav-menu li a:hover {
    text-decoration:none;
    font-weight: bold;
    background: #FFF;
        height: 38px;



}
#nav-menu li a.current {
    text-decoration:none;
    font-weight: bold;
    background: #FFF;
        height: 38px;

}

#container #main #imgcontainer #social .a2a_kit.a2a_default_style .a2a_dd {
    color: #663300;
}

#imagerow {
    clear: both;
    font-family: Georgia, "Times New Roman", Times, serif;
    width: 800px;
    padding-top: 10px;
    float: left;
}

#movers-row {
    font-family: Georgia, "Times New Roman", Times, serif;
    margin: -120px 0 0 120px;
    ;
}
#movers-row div {
    width: 20%;
    float: left;
}
#movers-row div img {
        float: right;
}
#studiomovers-row {
    overflow:auto
}
#studiomovers-row div {
    width: 25%;
    float: left;
}
#studiomovers-row img {
    float: right;
}


#social {
    font-size: 0.7em;
    font-family: Georgia, "Times New Roman", Times, serif;
    clear: both;
    padding-top: 70px;

}
#container #main #imagerow a #Image6 {
    float: left;
}
#social div {
    width: 138px;
}
#social #fb {
    width: 107px;
}
#social #email {
    width: 40px;
    height: 35px;
    margin-top: -3px;
}
#mainimage img {
    margin-left: 15px;
}
#container #main #rotxt {
    font-size: 0.8em;
    margin-top: 35px;
    margin-bottom: -10px;
    font-family: Georgia, "Times New Roman", Times, serif;
    padding-left: 1px;
}
#social div p a {
    text-decoration: none;
    color: #663300;
}

#social div img {
    float: left;
    padding-right:8px;
    clear: right;
}

#container #main ul li {
    font-size: 0.8em;
}
#contactbanner {
    float: left;
    position: relative;
    margin-top: -50px;
}
#main ul {
    padding-left: 30px;
}
#main a {
    text-decoration: none;
    font-weight: bold;
    color: #9848AD;
}
#telnos {
    font-size: 0.9em;
}
#main h1 {
    margin-top: 0px;
    margin-bottom: 1em;
    font-size: 1em;
}
#main #paleohori {
    padding-right: 10px;
    width: 378px;
    margin-top: 155px;
    padding-left: 250px;
}
#footer {
    background: url(graphics/footer.jpg) no-repeat;
    height: 242px;
    margin-top: -130px;
}
.clear {
    clear: both;
} 
#social div p {
    color: #663300;
    padding-right: 4px;
    padding-left: 1px;
    position: relative;
}

#social #etxt {
    color: #663300;
    padding-right: 5px;
    padding-left: 2px;


}
#social #twt {
    width: 105px;
}
#social a img {
    border-width: 0px;
}

My CSS that I am using for the whole site is here jsfiddle

---

make sure the <div id="fb"> doesn't have a style applied that is cropping the content (such as an overflow hidden and a smaller height).