Trouble passing html input to js

Tuesday, April 8, 2014

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Subscribe Page</title>
<script type="text/javascript"> function validate(number,carrier) {
var number = document.getElementById("number").value
var carrier = document.getElementById("carrier").value
      if (number=="") {
 alert("please enter phone number, it should be 10 numbers long")
return false;
  else function join(number,carrier) {
 return number + carrier;
 return true;
     var myresult = number.concat("carrier");
return myresult;


    <form action="" method="post" id="subscribeForm" >Phone number:<input name="number"  type="text" />
<select onchange="validate(number)" id="carrier">
<option id="verizon"value="">verizon</option>
<option id="att" value="">att</option>

<input type="submit" onclick="formsendscript.php" />

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