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HTML 

              
                <form name="names">
  <input type="text" id="box1" name="firstlastname" placeholder="Luke Skywalker"><br>
  <input type="text" id="box3" name="domain" placeholder="disney.com"><br>
  <input type="text" id="box2" name="sep" placeholder="Optional: custom separator"><br>
  <input type="submit" id="button-make" value="Make Variations" onClick="permutate(this.form);return false;">
</form>

<input type="submit" id="button-reset" value="Reset" onClick="reset('results');return false;">

<div id="results"></div>
!

CSS 

              
                #form{
  margin-top: 20px;
}

input[type]{
  font-size: 25px;
  font-family: arial;
}

#box1, #box2, #box3{
  width: 317px;
  padding: 10px 12px;
  margin-bottom: 10px;
  border: 1px solid rgb(200,200,200);
  border-top-color: rgb(100,100,100);
  border-radius: 5px;
  color: #5A5A5A;
}

#button-reset{
  position:relative;
  display:inline-block;
}

#button-make, #button-reset{
  float:left;
}

#button-reset{
  margin: 0 0 0 10px;
}

#results{
  position: relative;
  display: block;
  overflow: auto;
  margin-top: 45px;
  padding: 15px;
  border: 1px solid rgb(200,200,200);
  /*border-bottom: 1px solid rgb(200,200,200);*/
  background: rgb(245,245,245);
  color: rgb(50,50,50);
  font-size: 20px;
  line-height: 36px;
  font-family: arial;
}
!

JS 

              
                function permutate(form) {

  var firstlastname = form.firstlastname.value.toLowerCase().trim();
  var namesplit = firstlastname.split(" ");
  var firstname = namesplit[0];
  var lastname = namesplit[1];
  var domain = form.domain.value.toLowerCase().trim();
  var sep = form.sep.value + ' ';
  //var sep = ", ";
  
  if (firstname==null || firstname==""){
    document.getElementById("results").innerHTML= "Please provide a first name e.g. Luke";
    return false;    
  } else if (lastname==null || lastname==""){
    document.getElementById("results").innerHTML= "Please provide a last name e.g. Skywalker";
    return false;    
  } else if (domain==null || domain==""){
    document.getElementById("results").innerHTML= "Please provide a domain e.g. yahoo.com";
    return false;
  } else {}
  
  //If no optional separator, defult to comma
  if (sep==null || sep==" "){
    sep = ", ";
  }
  
  //bob@domain.com
  var p1 = firstname + "@" + domain + sep;
  
  //bobsmith@domain.com
  var p2 = firstname + lastname + "@" + domain + sep;
  
  //bob.smith@domain.com
  var p3 = firstname + "." + lastname + "@" + domain + sep;
  
  //smith@domain.com
  var p4 = lastname + "@" + domain + sep;
  
  //bsmith@domain.com
  var p5 = firstname.charAt(0) + lastname + "@" + domain + sep;

  //b.smith@domain.com
  var p6 = firstname.charAt(0) + "." + lastname + "@" + domain + sep;
  
  //bobs@domain.com
  var p7 = firstname + lastname.charAt(0) + "@" + domain + sep;
  
  //bob.s@domain.com
  var p8 = firstname + "." + lastname.charAt(0) + "@" + domain + sep;
  
  //bs@domain.com
  var p9 = firstname.charAt(0) + lastname.charAt(0) + "@" + domain;
  
  var addresses= p1 + p2 + p3 + p4 + p5 + p6 + p7 + p8 + p9;
  
	document.getElementById("results").innerHTML= addresses;
}

function reset(results) {
  document.getElementById("results").innerHTML= "";
  document.getElementById("box1").value = "";
  document.getElementById("box3").value = "";
  document.getElementById("box2").value = "";
}
!
999px

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