How about something like this (fiddle):
var messages = {
'stackoverflow': 'Stackoverflow, is a place...',
'admin': 'The admin is Nickname',
'password': 'Need password changing? Follow this steps...'
}
var result = document.getElementById('result');
var input = document.getElementById('input');
document.getElementById('submit').addEventListener('click', clickHandler);
function clickHandler() {
var message = messages[input.value];
if (message) {
result.innerHTML = message;
} else {
result.innerHTML = 'String not recognised';
}
}
HTML:
<input id="input" type="text"/>
<input id="submit" type="button" value="OK"/>
<div id="result"></div>