http://jsfiddle.net/or1x9sa7/

.main-header {
    background-color: transparent;
    height: 120px;
    -webkit-box-shadow: 0 0 3px 3px rgba(0, 0, 0, 0.4);
    -moz-box-shadow: 0 0 3px 3px rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 3px 3px rgba(0, 0, 0, 0.4);
    margin-bottom:60px;
    width:100%;
    z-index: 9999 !important;
    position:fixed;
}
.picBG2 {
    behavior: url(js/PIE.htc);
    /*background-color: #E87325;*/
    background-color: white;
    height:60px;
}
.nav-container {
    margin: 0 auto;
    position: relative;
    width: 960px;
    background-color:red !important;
    /* height: 60px !important; */
    behavior: url(js/PIE.htc);
}

.search_field2 {
    height:30px;
    font-size: 2em;
    behavior: url(js/PIE.htc);
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  border-radius: 5px;
  margin-top: 3px;

  width:100%;
}

<div style="position:relative; height: 130px;">
    <div class="main-header" style="z-index: 9997;">
        <div class="picBG2" style=""></div>
        <div class="header-bar">
            <header class="nav-container clearfix">
                <div class="searchbar clearfix" style="display:inline-block; top:-100px;  z-index: 9999 !important;">
            <form method="GET" action="search2.php" style= "padding: 1px; font-family: Tahoma, Geneva, sans-serif;">

            <fieldset>
                <input type="text" name="search" class="search_field2" value="" id="search" maxlength="20" />
            </fieldset>


            <input type="hidden" name="start" value="0" />
            <input type="hidden" name="limit" value="15" />
            </form>
            </div>
            </header>
        </div>
    </div><!-- end spacer -->