Logo image in the center of a menu doesnt sit right

Question

Ok so i have searched through probably 50 or so threads here on SO and cant find a solution yet. i have a navigation bar that is 1000px wide by 47px tall. i have a logo that is 135px tall and 167px wide. i want this image to sit dead center on the menu and extend above it. the image has the angled design i want to connect to the edges of the menu on either side. here is a mockup of what i would like for it to look like vs how it looks now.

My CSS:

.masthead {
    height: 70px;
    background-image: url(../img/rmr-masthead.png);
    background-repeat: no-repeat;
    background-position: center center;
}
/* == Nav Menu == */
.ribbon {
    width: 1000px;
    max-height: 47px;
    position: absolute;
    text-align: center;
    font-size: 17px!important;
    background: #bd7d4c;
    background: -webkit-gradient(linear, left top, left bottom, from(#bd7d4c), to(#7a4520));
    background: -webkit-linear-gradient(top, #bd7d4c, #7a4520);
    background: -moz-linear-gradient(top, #bd7d4c, #7a4520);
    background: -ms-linear-gradient(top, #bd7d4c, #7a4520);
    background: -o-linear-gradient(top, #bd7d4c, #7a4520);
    background-image: -ms-linear-gradient(top, #bd7d4c 0%, #7a4520 100%);
    -webkit-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    -moz-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
    box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}  
.ribbon:before, .ribbon:after {
    content:'';
    position: absolute;
    display: block;
    bottom: -1em;
    border: 1.5em solid #754a15;
    z-index: -1;
}
.ribbon:before {
    left: -2em;
    border-right-width: 1.5em;
    border-left-color: transparent;
    -webkit-box-shadow: rgba(000, 000, 000, 0.4) 1px 1px 1px;
    -moz-box-shadow: rgba(000, 000, 000, 0.4) 1px 1px 1px;
    box-shadow: rgba(000, 000, 000, 0.4) 1px 1px 1px;
}
.ribbon:after {
    right: -2em;
    border-left-width: 1.5em;
    border-right-color: transparent;
    -webkit-box-shadow: rgba(000, 000, 000, 0.4) -1px 1px 1px;
    -moz-box-shadow: rgba(000, 000, 000, 0.4) -1px 1px 1px;
    box-shadow: rgba(000, 000, 000, 0.4) -1px 1px 1px;
}
.ribbon .ribbon-content:before, .ribbon .ribbon-content:after {
    border-color: #66320f transparent transparent transparent;
    position: absolute;
    display: block;
    border-style: solid;
    bottom: -1em;
    content:'';
}
.ribbon .ribbon-content:before {
    left: 0;
    border-width: 1em 0 0 1em;
}
.ribbon .ribbon-content:after {
    right: 0;
    border-width: 1em 1em 0 0;
}
.nav {
    list-style-type:none;
    margin:0;
    padding:0;
    margin-left: auto;
    margin-right: auto;
    width: 901px;
    height: 0;
}
.nav li {
    display:block;
    float: left;
}
.nav li a {
    display:block;
    position: relative;
    z-index: 1;
    padding-top: 13px;
    padding-bottom: 12px;
    margin-left: 1px;
    width: 120px;
    font-size: 16px;
    color: #f5f5f5;
    text-shadow: #493724 0 -1px 0;
    text-decoration: none;
    border-right: 1px solid #6b3700;
    -webkit-box-shadow: 1px 0px 0px 0px rgba(212, 154, 91, 0.49);
    -moz-box-shadow: 1px 0px 0px 0px rgba(212, 154, 91, 0.49);
    box-shadow: 1px 0px 0px 0px rgba(212, 154, 91, 0.49);
}
.nav li:first-child {
    border-left: 1px solid #6b3700;
    -webkit-box-shadow: inset 1px 0px 0px 0px rgba(212, 154, 91, 0.49);
    -moz-box-shadow: inset 1px 0px 0px 0px rgba(212, 154, 91, 0.49);
    box-shadow: inset 1px 0px 0px 0px rgba(212, 154, 91, 0.49);
}
.nav li a:before {
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    opacity: 0;
    background: #c3885b;
    /* Old browsers */
    background: -moz-linear-gradient(top, #c3885b 0%, #905226 100%);
    /* FF3.6+ */
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #c3885b), color-stop(100%, #905226));
    /* Chrome,Safari4+ */
    background: -webkit-linear-gradient(top, #c3885b 0%, #905226 100%);
    /* Chrome10+,Safari5.1+ */
    background: -o-linear-gradient(top, #c3885b 0%, #905226 100%);
    /* Opera 11.10+ */
    background: -ms-linear-gradient(top, #c3885b 0%, #905226 100%);
    /* IE10+ */
    background: linear-gradient(to bottom, #c3885b 0%, #905226 100%);
    /* W3C */
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#c3885b', endColorstr='#905226', GradientType=0);
    /* IE6-9 */
    -webkit-transition: all 250ms linear;
    /* before hack */
    content:".";
    text-indent: -99999px;
}
.nav li a:hover:before {
    opacity: 1;
}
.ribbon img {
    position: relative;
    margin-top: -100px;
    background-color: whitesmoke;
    float: left;
    padding: 0;
    margin: 0;
    width: 167px;
    height: 117px;
    vertical-align:bottom;
    display: inline-block;
}

My HTML

<div class="masthead">
</div>

<div class="ribbon">
    <ul class="nav">
        <li><span class="navhover"></span><a href="index">Home</a>
        </li>
        <li><span class="navhover"></span><a href="about">About Us</a>
        </li>
        <li><span class="navhover"></span><a href="about">About Bison</a>
        </li>
    </ul>
    <img src="./img/logo-nav.png">
    <ul class="nav">
        <li><span class="navhover"></span><a href="recipies">Recipies</a>
        </li>
        <li><span class="navhover"></span><a href="products">Products</a>
        </li>
        <li><span class="navhover"></span><a href="contact">Contact Us</a>
        </li>
    </ul>
</div>

Answer 1

margin: 0; in your css .ribbon img cancel margin-top: -100px; above. So simply remove margin: 0; like this:

.ribbon img {
    position: relative;
    margin-top: -100px;
    background-color: whitesmoke;
    float: left;
    padding: 0;
    width: 167px;
    height: 117px;
    vertical-align:bottom;
    display: inline-block;
}

Answer 2

Looks like you'll need to set a negative margin-top on logo-nav.png (i'd do it inline on an img tag, personally), might also have to set the z-index so the image is above everything else (if it isn't already).