SOWIN = (navigator.userAgent.toLowerCase().indexOf("win") > -1) ? 1 : 0; 
SOMAC = (navigator.userAgent.toLowerCase().indexOf("mac") > -1) ? 1 : 0; 
SOLIN = (navigator.userAgent.toLowerCase().indexOf("linux") > -1) ? 1 : 0; 
SOALT = (!SOWIN && !SOMAC && !SOLIN) ? 1 : 0; 

OP = ((ind1 = navigator.userAgent.indexOf("Opera")) > -1) ? 1 : 0; 
punto = (OP) ? navigator.userAgent.indexOf(".",ind1):0; 
OP5 = (OP && parseInt(navigator.userAgent.substr(punto-1)) == 5) ? 1 : 0;
OP6 = (OP && parseInt(navigator.userAgent.substr(punto-1)) == 6) ? 1 : 0;

IE = ((ind2 = navigator.appVersion.indexOf("MSIE")) > -1 && !OP) ? 1 : 0;
IE4 = (IE && parseInt(navigator.appVersion.substr(ind2+5)) == 4) ? 1 : 0;
IE5 = (IE && parseInt(navigator.appVersion.substr(ind2+5)) == 5) ? 1 : 0;
IE6 = (IE && parseInt(navigator.appVersion.substr(ind2+5)) == 6) ? 1 : 0;
IE7 = (IE && parseInt(navigator.appVersion.substr(ind2+5)) == 7) ? 1 : 0;
IE8 = (IE && parseInt(navigator.appVersion.substr(ind2+5)) == 8) ? 1 : 0;

NN = (navigator.appName.indexOf("Netscape")>-1) ? 1 : 0; 
NN4 = (NN && parseInt(navigator.appVersion)==4) ? 1 : 0; 
NN6 = (NN && parseInt(navigator.appVersion)>4) ? 1 : 0; 

OT = (!IE && !NN && !OP) ? 1 : 0; 

var page = "index.php"; 
if(IE6 || IE7)
  window.location.href = page+"?browser=explorer67"; 
else
  window.location.href = page+"?browser=other";