Css problem (tror jag)

Jag har problem med mina hemsidor i Netscape 4 och framåt. Tror att det har att göra med mina css dokument.

Webläsarna verkar total-ignorera mina rubrik angivelser.
Finns det ett attribut som heter: "font-weight: lighter;" ?
Annars måste jag ha drömt det... ;)
Så här min css fil ut:

a:link {
	font-family: Verdana, Arial, Serif; 
	color: #000000; 
	background-color: transparent;
	text-decoration: none; 
	font-size: 11px; 
	font-weight: normal;
}

a:visited {
	font-family: Verdana, Arial, Serif; 
	color: #AAAAAA; 
	background-color: transparent;
	text-decoration: none; 
	font-size: 11px; 
	font-weight: normal;
}

a:hover {
	font-family: Verdana, Arial, Serif;
	color: #922727;
	background-color: transparent;
	text-decoration: underline;
	font-size: 11px; 
	font-weight: normal;
}

body {
	font-family: Verdana, Arial, Serif;
	font-size: 11px;
	color: #000;
	font-weight: lighter;
	margin-left: 0px;
	margin-bottom: 0px;  
	padding: 0px; 
	width: 100%; 
	background: #fff url(bilder/bg_ws.jpg) no-repeat fixed;
}

table, tr, td {
	font-family: Verdana, Arial, Serif; 
	font-size: 11px;
	color: #000;
	font-weight: lighter;
}

h1 { 
	font-family: Verdana, Arial, Serif;
	font-size: 24px
	color: #000
	font-weight: lighter;
}	

h2 { 
	font-family: Verdana, Arial, Serif;
	font-size: 20px 
	color: #000
	font-weight: lighter;
}	

h3 { 
	font-family: Verdana, Arial, Serif;
	font-size: 18px
	color: #000
	font-weight: lighter;
}	

h4 { 
	font-family: Verdana, Arial, Serif; 
	font-size: 14px
	color: #000
	font-weight: lighter;
}