browser tespiti

// Internet Explorer

var ie = document.all != null; //ie4 and abovevar ie5 = document.getElementById && document.all;

var ie6 = document.getElementById && document.all&&(navigator.appVersion.indexOf("MSIE 6.")>=0); 

 
// Netscape

var ns4 = document.layers != null;var ns6 = document.getElementById && !document.all;

var ns = ns4 || ns6; 

 
// Firefox

var ff = !document.layers && !document.all; 

 
// Opera

var op = navigator.userAgent.indexOf("opera")>0;

var op7 = op && operaVersion() <= 7;

var op8 = op && operaVersion() >= 8; 

 
// Detects the Opera version

function operaVersion() {    

agent = navigator.userAgent;    

idx = agent.indexOf("opera");    

if (idx>-1) {    

return parseInt(agent.subString(idx+6,idx+7));    

}}

// Internet Explorer

var ie = document.all != null; //ie4 and abovevar ie5 = document.getElementById && document.all;

var ie6 = document.getElementById && document.all&&(navigator.appVersion.indexOf("MSIE 6.")>=0); 

 
// Netscape

var ns4 = document.layers != null;var ns6 = document.getElementById && !document.all;

var ns = ns4 || ns6; 

 
// Firefox

var ff = !document.layers && !document.all; 

 
// Opera

var op = navigator.userAgent.indexOf("opera")>0;

var op7 = op && operaVersion() <= 7;

var op8 = op && operaVersion() >= 8; 

 
// Detects the Opera version

function operaVersion() {    

agent = navigator.userAgent;    

idx = agent.indexOf("opera");    

if (idx>-1) {    

return parseInt(agent.subString(idx+6,idx+7));    

}}