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var palindrome = "a man a plan a canal panama";
 
function detectPalindrome(inThisString){
    // first we remove all the white space, because we're going on the premise that it's
    // non significant
    var testString = inThisString.replace(/\W/g, "");
    // then we just compare the letter at a given offset from the front to the letter of
    // the same offset from the back, any difference no palindrome
    for (var x=0;x< testString.length;x++){
        if (testString[x] != testString[testString.length - (x + 1)]){
            return false;
        }
    }
    return true;
}
 
var palindromeIsPalindrome = detectPalindrome(palindrome);
var nonPalindromeIsPalindrome = detectPalindrome("rooster");
 
alert("Palindrome: " + palindromeIsPalindrome + "\nNon: " + nonPalindromeIsPalindrome);