if (navigator.userAgent.indexOf("Firefox")!=-1)
             document.write("<style type=\"text/css\">@import url(\"style-ff.css\");</style>");

                else if (navigator.userAgent.indexOf("MSIE")!=-1)
	           	document.write("<style type=\"text/css\">@import url(\"style.css\");</style>");


                      else if (navigator.userAgent.indexOf("Chrome")!=-1)
           			document.write("<style type=\"text/css\">@import url(\"style-cr.css\");</style>");

				else
				  location.href="aviso.html";