//Detecta explorador (MSIE3, MSIE4, MSIE5, MSIE6, NS3, NS4, NS6, NS7, OTHER)
version=parseInt(navigator.appVersion);
if (navigator.appVersion.indexOf('5.')>-1){version=5};
if (navigator.appVersion.indexOf('6.')>-1){version=6};
if (navigator.appVersion.indexOf('7.')>-1){version=7}; 
browser='OTHER';
if (navigator.appName=='Netscape'){browser='NS'+version;} 
if (navigator.appName=='Microsoft Internet Explorer'){browser='MSIE'+version;}
if (navigator.appVersion.indexOf('MSIE 3')>0) {browser='MSIE3';}
if (browser == 'NS5'){browser='NS6'};