body {
	text-align: center;
	background-color: #000000;
}

#container {
	text-align: left;
	width: 1000px;
	height: 667px;
	margin: 0 auto;
	position: relative;
	background-color: #cccccc;
	background-image:  url(images/bg_strip.gif);
	background-repeat: repeat-x;
}

 
 #gallery {
	text-align: left;
	width: 1000px;
	height: 667px;
	margin: 0 auto;
	position: relative;
	background-color: #181818;
}

 
 #redbody {
	text-align: left;
	width: 960px;
	height: 515px;
	margin: 0 auto;
	position: absolute;
	left: 20px;
	top: 129px;
	z-index: 1;
	background-image:  url(images/red_bg.gif);
	border: 1px none #000000;
}

/*
#navigation {
	width: 950px;
	height: 55px;
	padding-top: 20px;
	position: absolute;
	left: 5px;
	top: 1px;
	font-family: arial;
	font-size: 10ems;
	color: #ffffff;
}

Using line-height instead of height gives the same effect so 
long as you don't wrap onto a new line but with the benefit 
that the text vertically centres within the height. This 
change ties in with the change to .nav below.

The absolute/top/left isn't needed, nor is the top padding.

Added sans-serif to the font families as a fall back.

Fixed the font size - ems isn't a proper unit, you need em and to use a decimal value.

*/
#navigation {
	width: 950px;
	line-height: 55px;
	font-family: arial, sans-serif;
	font-size: 1em;
	color: #ffffff;
}

#mainpic {
	width: 960px;
	height: 442px;
	margin: 0 auto;
	position: absolute;
	left: 0px;
	top: 57px;
	background-image:  url(images/tent.jpg);
}

#mainpic1 {
	width: 960px;
	height: 442px;
	margin: 0 auto;
	position: absolute;
	left: 0px;
	top: 57px;
	background-image:  url(images/jump.jpg);
}

#mainpic2 {
	width: 960px;
	height: 442px;
	margin: 0 auto;
	position: absolute;
	left: 0px;
	top: 57px;
	background-image:  url(images/look.jpg);
}

#mainpic3 {
	width: 960px;
	height: 442px;
	margin: 0 auto;
	position: absolute;
	left: 0px;
	top: 57px;
	background-image:  url(images/jimi.jpg);
}

#mainpic4 {
	width: 960px;
	height: 442px;
	margin: 0 auto;
	position: absolute;
	left: 0px;
	top: 57px;
	background-image:  url(images/tent.jpg);
}

#content {
	width: 410px;
	height: 422px;
	position: absolute;
	left: 530px;
	top: 0px;
	padding: 10px;
	background-color: #d02a24;
	filter: alpha(opacity=80);
	opacity: 0.8;
	font-size: 0.8em;
	overflow: auto;
	font-family: arial, "Palatino Linotype", sans-serif;
	color: #ffffff;
}

/*
remove -moz-opacity: 0.8; from #content as it isn't needed except 
for obsolete versions of Moz/FF 

As Palatino Linotype is a serif font you might want to consider 
its pairing with arial. Added sans-serif as a fallback. Also added
required quote marks around the two word font name.

Fixed the font size 
*/
a, a:link, a:visited {
	font-family: "Palatino Linotype", Helvetica, sans-serif;
	font-size: 1.2em;
	color: #ffffff;
	text-decoration: none;
}

a:hover {
	background-color: #181818;
}

a:active {
	background-color: #000000;
}

/*
a:link {
	font-family: Palatino Linotype, Helvetica, sans-serif;
	font-size: 12ems;
	color: #ffffff;
	text-decoration: none;
}

a:visited {
	font-family: Palatino Linotype, Helvetica, sans-serif;
	font-size: 12ems;
	color: #ffffff;
	text-decoration: none;
}

a:hover {
	font-family: Palatino Linotype, Helvetica, sans-serif;
	font-size: 12ems;
	color: #ffffff;
	text-decoration: none;
	background-color: #181818;
}

a:active {
	font-family: Palatino Linotype, Helvetica, sans-serif;
	font-size: 12ems;
	color: #ffffff;
	text-decoration: none;
	background-color: #000000;
}

Here I've consolidated your link styles, fixed the ref 
to Palatino Linotype and fixed the font sizes.
As with above you're mising serif with sans-serif 
typefaces here.

*/
.nav {
	list-style-type: none;
	overflow: hidden; /* added overflow to clear the floats, needed for alignment in FF */
	margin-top: 0;
	padding-top: 0; /* added top margin and padding settings so that menu aligns properly */
}

.nav li {
	float: left;
	text-align: center;
	margin: 0;
	padding: 0; /* added margin and padding setting so that the menu aligns properly */
}

.nav li a {
	display: block;
	width: 100px;
}

		
h1 {
	font-family: Arial, Helvetica, sans-serif;
	font-size: 1.4em;
	color: #FFFFFF;
}
h2 {
	font-family: Arial, Helvetica, sans-serif;
	font-size: 1em;
	color: #FFFFFF;
}