bName = navigator.appName;

if ((screen.availWidth > 764) || (bName == "Netscape"))
{
document.write("<frameset cols='100%,*' framespacing=0 frameborder=0 border=0>");
document.write('<frame src="http://www.macchine-servizi.com" name="main">');
document.write('<\/frameset>');
}