var navegador=navigator.appName;
	var ie=false;
	var ns=false;

	if (navegador=='Microsoft Internet Explorer'){var ie=true;}
	if (navegador=='Netscape'){var ns=true;}
	if(ie){document.write("<link rel='StyleSheet' href='includes/estilos/ie_estilos.css' type='text/css'>")};
    if(ns){document.write("<link rel='StyleSheet' href='includes/estilos/ns_estilos.css' type='text/css'>")};
	
	if(ie){var tamano=screen.availHeight};
	if(ns){var tamano=window.outerHeight}
	
	
	if(tamano < 650){
				if(ie){var ie1024=false;var ie800=true;}
				if(ns){var ns1024=false;var ns800=true;}
				};
	if(tamano > 650){
				if(ie){var ie1024=true;var ie800=false;};
				if(ns){var ns1024=true;var ns800=false;};			
				}