var agt=navigator.userAgent.toLowerCase();
 var is_opera6 = (agt.indexOf("opera 6") != -1 || agt.indexOf("opera/6") != -1); // new 020128- abk
 var is_opera7 = (agt.indexOf("opera 7") != -1 || agt.indexOf("opera/7") != -1);
 var is_opera8 = (agt.indexOf("opera 8") != -1 || agt.indexOf("opera/8") != -1);
 var opera = is_opera6 || is_opera7 || is_opera8;
if(document.all){

document.write('<'+'link rel="stylesheet" media="screen" type="text/css" href="/styles/norse_ie_left.css" />');

}
else {

document.write('<'+'link rel="stylesheet" media="screen" type="text/css" href="/styles/norse_firefox_left.css" />');
}