element.style {
background:transparent url(http://www.happyhooker-fishing.com/modules/mod_beinvolved/images/facebook.png) no-repeat scroll right top !important;
cursor:pointer;
display:block;
height:100px;
position:absolute;
right:0;
text-decoration:none;
text-indent:-999em;
top:0;
width:100px;
z-index:99999;
}

This is a css conflict with your template. 
To override it, just go to plugins/content/plugin_jw_sig/sig.css folder at line 15 and change this: 

#lbPrevLink, #lbNextLink {
    display: block;
    outline: medium none;
    position: absolute;
    top: 0;
    width: 50%;
}

#lbPrevLink, #lbNextLink {
    background: none repeat scroll 0 0 transparent;
    display: block;
    outline: medium none;
    position: absolute;
    top: 0;
    width: 50%;
}