How to Display Message "Caps Lock is on" on Password Text Box Using Javascript.

Below is the Script to identify if the Caps Lock is on  While typing on password text box.

Caps Lock is On Message Display.

sample code:
   <script type="text/javascript" language="Javascript">
        function capLock(e) {
            kc = e.keyCode ? e.keyCode : e.which;
            sk = e.shiftKey ? e.shiftKey : ((kc == 16) ? true : false);
            if (((kc >= 65 && kc <= 90) && !sk) || ((kc >= 97 && kc <= 122) && sk))
                document.getElementById('divMayus').style.visibility = 'visible';
            else
                document.getElementById('divMayus').style.visibility = 'hidden';
        }
    </script>

Call this Function on the keypress event of the Password Text Box.
onkeypress="capLock(event)"

Now, The Message will be displayed on the div with id="divMayus" as below.

<div id="divMayus" style="visibility: hidden; "><P style="color:red;">Caps Lock is on.</P></div>

JavaScript Function to Disable Back Event of web-Browser.

This Function adds # and 1 to window location in a very short period, fraction of second so that There is no Previous page Other than same page for back space of browser back event.
So it does not actually disables the back event but makes the page behave like that.

  //disable back button of web-Browser

        function changeHashOnLoad() {
            window.location.href += "#";
            setTimeout("changeHashAgain()", "50");
        }

        function changeHashAgain() {
            window.location.href += "1";
        }

        var storedHash = window.location.hash;
        window.setInterval(function () {
            if (window.location.hash != storedHash) {
                window.location.hash = storedHash;
            }
        }, 50);
        changeHashOnLoad();