How to use php mailer function?

/*---------- Validation Script ---------------*/

<script>
function validateForm()
{

var x=document.forms["myForm"]["name"].value;
if (x==null || x=="")
  {
  alert("Name must be filled out");
  return false;
  }

var y=document.forms["myForm"]["contact"].value;
if (y==null || y=="")
  {
  alert("Contact must be filled out");
  return false;
  }

var z=document.forms["myForm"]["address"].value;
if (z==null || z=="")
  {
  alert("Address must be filled out");
  return false;
  }

var m=document.forms["myForm"]["msg"].value;
if (m==null || m=="")
  {
  alert("What is your message? Please write in message field.");
  return false;
  }


var e=document.forms["myForm"]["email"].value;
var atpos=e.indexOf("@");
var dotpos=e.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=e.length)
  {
  alert("Not a valid e-mail address");
  return false;
  }
}
</script>


/*------------- Php Coding ------------------*/


<?php

if (isset($_GET['submit'])){

/* Set e-mail recipient */
$myemail = "RECIPIENT EMAIL ADDRESS";
$name = $_GET['name'];
$ct = $_GET['contact'];
$ad = $_GET['address'];
$email = $_GET['email'];
$msg = $_GET['msg'];
$from = '$name';

/* Let's prepare the message for the e-mail */

$message = "

Name: $name

Email: $email

Contact: $ct

Address: $ad

Message: $msg

";

/* Send the message using mail() function */
$m = mail($myemail,"$name", $message) or die("failed");
if ($m)
{
echo "Message Sent Successfully";
 }
else
{
echo "Message Failed";
}
}
?>


/*--------------- Html Coding ------------------------*/


<form name="myForm" method="get" action="" onsubmit="return validateForm();">
<table>
<tr><td><h5>Name</h5></td><td><input type="text" name="name"/></td></tr>
<tr><td><h5>Email</h5></td><td><input type="text" name="email"/></td></tr>
<tr><td><h5>Phone</h5></td><td><input type="text" name="contact"/></td></tr>
<tr><td><h5>Address</h5></td><td><input type="text" name="address"/></td></tr>
<tr><td valign="top"><h5>Message</h5></td><td><textarea name="msg" cols="30" rows="10"/></textarea></td></tr>
<tr><td></td><td><input type="submit"  name="submit" /></td></tr>
</table>
</form>



Paste this code in your contact.php page and replace the word "RECIPIENT EMAIL ADDRESS"   with your email address where to receive email....