Cool Forum: Feuille de style

Voila je voudrais mettre une feuille de style à par tout en conservant celle qui existe deja

j'ai mis ce code (en rouge) mais cela ne marche pas
<!--********** TPL NAME = htmlheader **********-->
<html>

<head>

<title>{%::_FORUMCFG[forumname]%}{%::TopicName%}</title>
<link rel=stylesheet type="text/css" href="templates/cool/styles.css">
<style type="text/css">
body{margin:.0 in .0 in;
	scrollbar-face-color: {%::_SKIN[bgtable3]%};
	scrollbar-Base-Color : {%::_SKIN[textcol1]%};
	scrollbar-arrow-color: {%::_SKIN[textcol1]%};
	scrollbar-track-color: {%::_SKIN[bgtable2]%};
	scrollbar-3d-light-color: {%::_SKIN[bgtable2]%};
	scrollbar-darkshadow-color: {%::_SKIN[textcol1]%};
	scrollbar-Highlight-Color :{%::_SKIN[textcol1]%};
}

a.men:link{color: {%::_SKIN[lien1col]%}; text-decoration:underline;}
a.men:visited{color: {%::_SKIN[lien1visit]%}; text-decoration:underline;}
a.men:hover{color: {%::_SKIN[lien1hov]%}; text-decoration:none;}

a:link{color: {%::_SKIN[lien1col]%}; text-decoration:underline;}
a:visited{color: {%::_SKIN[lien1visit]%}; text-decoration:underline;}
a:hover{color: {%::_SKIN[lien1hov]%}; text-decoration:none;}

a.lien:link{color: {%::_SKIN[lien2col]%}; text-decoration: underline;}
a.lien:visited{color: {%::_SKIN[lien2visit]%}; text-decoration: underline;}
a.lien:hover{color: {%::_SKIN[lien2hov]%}; text-decoration:none;}


{%box[cssform]%}

.corp{font-family:{%::_SKIN[font]%}; color:{%::_SKIN[textcol1]%};}
.corp2{font-family:{%::_SKIN[font]%}; color:{%::_SKIN[textcol2]%};}

{%box[grpcolor]%}

a.infombban:link{color: {%::_SKIN[bangrp]%}; text-decoration: underline;}
a.infombban:visited{color: {%::_SKIN[bangrp]%}; text-decoration: underline;}
a.infombban:hover{color: {%::_SKIN[bangrp]%}; text-decoration:none;}
.fixembban{color: {%::_SKIN[bangrp]%};}

.onboutton {border-style: outset; border-width: 2px;}
.outboutton {border-style: none; border-width: 0px;}

.quote_class{
	background: {%::_SKIN[bgtable3]%};
	border: 1px solid {%::_SKIN[textcol1]%};
	color: {%::_SKIN[textcol1]%};
	font-size: 10px;
	margin: 8px auto 0 auto;
	padding: 3px;
}

.code_class{
	background: {%::_SKIN[bgtable2]%};
	border: 1px solid {%::_SKIN[textcol1]%};
	color: {%::_SKIN[textcol2]%};
	font-size: 10px;
	margin: 8px auto 0 auto;
	padding: 3px;
}

</style>

	<script language="javascript">
	<!--
	function popup(url,width,height)
	{
	  newwin=window.open(url,'NewFenetre','toolbar=no, location=no, menubar=no, scrollbars=yes, resizable=yes, width='+width+', height='+height); 
	}
	-->
	</script>

</head>

<body bgcolor={%::_SKIN[bg1]%}>