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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <p id="hello">Hello World</p>
  <form id="register">
    <label for="username">Username</label>
    <input type="text" class="input_text" name="username" id="name" placeholder="e.g. AberLibrary01" />
    <br />
    <label for="password">Password</label> 
    <input type="text" class="input_text" name="password1" id="password1" placeholder="e.g. aber01" />
    <br />
    <label for="re-enterpassword">Re-enter password</label>
    <input type="text" class="input_text" name="password2" id="password2" placeholder="e.g. aber01" />
​
    <input type="submit" class="button" onclick="validate()" value="Register" />
    </form>
​
</body>
</html>
 
​
    function validate()
{
        var pw1 = document.getElementById("password1").value;
        var pw2 = document.getElementById("password2").value;
​
        //Check values are present in both fields
        if(pw1 ==='' || pw2 === '')
        {
            alert("Please enter your password twice.");
            return false;
        }
        //Check there no spaces
        else if(document.getElementById("password1").value.indexOf(invalid) > - 1) 
        {
            alert("Spaces are not allowed in passwords!");
            return false;
        }
        //Check passwords are the same
        else
        {
            if(pw1 != pw2) 
            {
                alert("The passwords you entered were not the same. Please try again!");
                return false;
            }
            else
            {
                alert("Password accepted!");
                return true;
            }
        }
​
    }
Output

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