simple css tabbeb menus-last submit input button not showing

Before asking any questions,i would like to thank phpfreaks forum for answering my questions.. Really helpful, thanks again.. 

i have this tabbed menu.. it worked nicee.. but when i add input submit at last, it is not shown,pls help.. might be css issue, tried that some things, but didn't work, pls help...

css 

<style>

ul.tabs {
margin: 0;
padding: 0;
float: left;
list-style: none;
height: 32px; /*--Set height of tabs--*/
border-bottom: 1px solid #999;
border-left: 1px solid #999;
width: 100%;
}

ul.tabs li {
float: left;
margin: 0;
padding: 0;
height: 31px; /*--Subtract 1px from the height of the unordered list--*/
line-height: 31px; /*--Vertically aligns the text within the tab--*/
border: 1px solid #999;
border-left: none;
margin-bottom: -1px; /*--Pull the list item down 1px--*/
overflow: hidden;
position: relative;
background: #e0e0e0;
}

ul.tabs li a {
text-decoration: none;
color: #000;
display: block;
font-size: 1.2em;
padding: 0 20px;
border: 1px solid #fff; /*--Gives the bevel look with a 1px white border inside the list item--*/
outline: none;
}

ul.tabs li a:hover {
background: #ccc;
}

html ul.tabs li.active, html ul.tabs li.active a:hover  { /*--Makes sure that the active tab does not listen to the hover properties--*/
background: #fff;
border-bottom: 1px solid #fff; /*--Makes the active tab look like it's connected with its content--*/
}

.tab_container {
border: 1px solid #999;
border-top: none;
//overflow: hidden;
clear: both;
float: left; width: 100%;
background: #fff;
height:auto;
}

.tab_content {
padding: 20px;
font-size: 1.2em;
color:#333;
height:auto;
}
* {
  margin:0; // disable for button
  padding:0; // disable for button
  border:0; // disable for button
}

</style>

script for tab

<script type="text/javascript">
$(document).ready(function() {
//Default Action
$(".tab_content").hide(); //Hide all content
$("ul.tabs li:first").addClass("active").show(); //Activate first tab
$(".tab_content:first").show(); //Show first tab content
//On Click Event
$("ul.tabs li").click(function() {
$("ul.tabs li").removeClass("active"); //Remove any "active" class
$(this).addClass("active"); //Add "active" class to selected tab
$(".tab_content").hide(); //Hide all tab content
var activeTab = $(this).find("a").attr("href"); //Find the rel attribute value to identify the active tab + content
$(activeTab).fadeIn(); //Fade in the active content
return false;
});
});
</script>