Function for browser checkin IE

function browserChecking(){
$browser = get_browser(null, true);
if($browser[browser]=="IE"){
return true;
}
}

function isIeSeven() {
$useragent=$_SERVER['HTTP_USER_AGENT'];
if (stristr($useragent, 'msie 7')) {
return true;
}else{
return false;
}
}

function isIeSix() {
$useragent=$_SERVER['HTTP_USER_AGENT'];
if (stristr($useragent, 'msie 6')){
return true;
} else{
return false;
}
}