body
{
	margin: 0px;
}
.header_block 
{
	background-color: rgb(115,117,153);
	text-align: center;
	border-bottom: thin solid rgb(0,0,0);
	padding: 10px;
}
.menu_block 
{
	position: relative;
	display: block;
	text-align: center;
	padding-top: 5px;
	vertical-align: top;
}
.content_block 
{
	padding-left: 14%;
	padding-right: 14%;
	text-align: left;
}

a img {
	height: 60px; 
	width: 112px; 
	border-width: 0; 
	background: top left no-repeat;
	display: inline;
	margin: 0 auto;
}

a#home_btn img {
	background-image: url(../images/home_btn.gif);
}
a#home_btn:hover img {
	background-image: url(../images/home_btn.gif);
}

a#lit_btn img {
	background-image: url(../images/lit_btn.gif);
}
a#lit_btn:hover img {
	background-image: url(../images/lit_roll_btn.gif);
}

a#links_btn img {
	background-image: url(../images/links_btn.gif);
}
a#links_btn:hover img {
	background-image: url(../images/links_roll_btn.gif);
}

a#examples_btn img {
	background-image: url(../images/examples_btn.gif);
}
a#examples_btn:hover img {
	background-image: url(../images/examples_roll_btn.gif);
}

a#methods_btn img {
	background-image: url(../images/methods_btn.gif);
}
a#methods_btn:hover img {
	background-image: url(../images/methods_roll_btn.gif);
}

a#comments_btn img {
	background-image: url(../images/comments_btn.gif);
}
a#comments_btn:hover img  {
	background-image: url(../images/comments_roll_btn.gif);
}

a#data_btn img {
	background-image: url(../images/data_btn.gif);
}
a#data_btn:hover img {
	background-image: url(../images/data_btn.gif);
}

a .alt { display: none; }


/* Input form layout styles... */

.input_section {
	width: 90%;
}

.input_header {
	text-align: left;
	margin-top: 10px;
	margin-bottom: 10px;
	
}

.input_row {
	text-align: left;
	padding-top: 6px;
	padding-bottom: 6px;
}

.input_lcell {
	width: 35%;
	float: left;
	text-align: left;
	
}

.input_rcell {
	width: 65%;
	float: left;
	text-align: left;
	
}