function validBrowser(){
var u_agent = navigator.userAgent;
var browser_name='Failed to identify the browser';
if(u_agent.indexOf('Firefox')>-1){
browser_name='Firefox';
}else if(u_agent.indexOf('Chrome')>-1){
browser_name='Chrome';
}else if(u_agent.indexOf('Trident')>-1&&u_agent.indexOf('rv:11')>-1){
browser_name='IE11';
}else if(u_agent.indexOf('MSIE')>-1&&u_agent.indexOf('Trident')>-1){
browser_name='IE(8-10)';
}else if(u_agent.indexOf('MSIE')>-1){
browser_name='IE(6-7)';
}else if(u_agent.indexOf('Opera')>-1){
browser_name='Opera';
}else{
browser_name+=',info:'+u_agent;
}
document.write('browser_name:'+browser_name+'<br>');
document.write('u_agent:'+u_agent+'<br>');
}

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