application working like 32 bit IE, even if I start with 64 bit IE

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Java

I have a web product (java), that is developed by other team. When ever I access that product using 64 bit browser, It is saying this browser is 32 bit browser. I use a javascript code for checking the browser is 64 or 32 bit.
Here is that js code :

if (navigator.userAgent.indexOf("WOW64") != -1 )
{
   alert("This is a 32 bit browser");
}
else if ( navigator.userAgent.indexOf("Win64") != -1 ) {
     alert("This is a 64 bit browser");
}
else {
   alert("This is a 32 bit OS");
}

Please help me how to change into 64 bit