var agt=navigator.userAgent.toLowerCase();
if ( (parseInt(navigator.appVersion)>=4) 
&&  (agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
&& (agt.indexOf('compatible') == -1) ) {
	if (parseInt(navigator.appVersion)>=5) document.write('<link href="../../scripts_styles/screen_ie.css" media="screen" rel=stylesheet type="text/css">');
	else document.write('<link href="../../scripts_styles/screen_ns.css" media="screen" rel=stylesheet type="text/css">');
} else {
 if ( (parseInt(navigator.appVersion)>=4) 
 && (agt.indexOf('msie') != -1) ) {
 document.write('<link href="../../scripts_styles/screen_ie.css" media="screen" rel=stylesheet type="text/css">');
 }
}