font-family is causing a warning ???

[liunx]

Line : 0 font-family: You are encouraged to offer a generic family as a last alternative

/* ====================[ Text and Special tag formatting ] ==================== */

body {
color: #1F1F1F;
font-family : verdana, arial, helvetica, sans-serif;
font-size: 70%;
line-height: 140%;
margin: 0px;
padding: 0px;
}

img {
border: 0px;
}

a, a:visited {
background-color: #FFFFFF;
color: #790102;
text-decoration: underline;
}

a:hover {
background-color: #FFFFFF;
text-decoration: none;
}

h1, h2, h3, h4, h5, h6 {
background-color: #FFFFFF;
color: #790102;
padding: 0px;
margin: 0px;
}

h1 { font-size: large; }
h2 { font-size: medium;}
h3 { font-size: small; }

ul {
list-style-type:square;
}

abbr, acronym {
background-color: #DDDDDD;
cursor: help;
}

code, pre {
color: #008000;
font-family: "Courier New", Courier, mono;
font-size: 105%;
}

html>body code, pre {
color: #008000;
font-family: "Courier New", Courier, mono;
font-size: 100%;
}

/* ====================[ Layout ] ==================== */

#container {
background-color: #FFFFFF;
margin: 0px;
padding: 0px;
}

/* ====================[ Banner ] ==================== */

#banner {
background-color: #FFFFFF;
height: 50px;
margin: 0px;
padding: 0px;
}

.banner_left {
float: left;
text-align: left;
width: 49%;
}

.banner_right {
float: right;
text-align: right;
width: 49%;
}

.spacer {
clear: both;
font-size: 0px;
line-height: 0px;
}

/* ====================[ Top Navigation ] ==================== */

#nav {
background-color: #1F1F1F;
border-top: 3px solid #CCCCCC;
height: 30px;
line-height: 30px;
margin: 0px;
padding: 0px;
}

#nav a {
background-color: #1F1F1F;
color: #FFFFFF;
font-weight: bold;
margin: 0px 10px;
text-decoration: none;
}

#nav a:hover {
background-color: #1F1F1F;
border-bottom: 4px solid #FFFFFF;
color: #CCCCCC;
padding-bottom: 5px;
}

#nav .active_link {
background-color: #1F1F1F;
border-bottom: 4px solid #FFFFFF;
color: #CCCCCC;
padding-bottom: 5px;
}

/* ====================[ Main Content ] ==================== */

#content {
background-color: #FFFFFF;
margin: 10px 185px;
padding: 0px;
}

/* ====================[ Sidebar Menu ] ==================== */

.menu {
background-color: #F4F4F4;
margin: 0px;
padding: 0px;
}

.menu_title {
background-color: #790102;
border-top: 2px solid #CCCCCC;
color: #FFFFFF;
font-weight: bold;
line-height: 25px;
text-indent: 10px;
}

.menu_content {
margin: 5px 5px 10px 5px;
}

/* ====================[ Left Sidebar ] ==================== */

#sidebar_left a {
background-color: #F4F4F4;
}

#sidebar_left {
float: left;
margin: 10px 0px;
padding: 0px;
width: 170px;
}

/* ====================[ Right Sidebar ] ==================== */

#sidebar_right a {
background-color: #F4F4F4;
}

#sidebar_right {
float: right;
margin: 10px 0px;
padding: 0px;
width: 170px;
}

/* ====================[ Footer ] ==================== */

#footer {
clear: both;
padding: 0;
margin: 0;
background-color: #CCCCCC;
}I think it may be that you need to use "monospace" instead of "mono" for the couple places you have:
font-family: "Courier New", Courier, mono