PHP Program for Submitting Form to E-mail

Recently during a website redesign, I wanted to create a program to submit forms to email. Many solutions I found didn’t work, so I developed my own.
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<html>
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<body>
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<?php
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function spamcheck($field)
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  {
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  //filter_var() sanitizes the e-mail
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  //address using FILTER_SANITIZE_EMAIL
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  $field=filter_var($field, FILTER_SANITIZE_EMAIL);
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  //filter_var() validates the e-mail
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  //address using FILTER_VALIDATE_EMAIL
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  if(filter_var($field, FILTER_VALIDATE_EMAIL))
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    {
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    return TRUE;
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    }
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  else
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    {
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    return FALSE;
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    }
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  }
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if (isset($_REQUEST['w_14']))
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  {//if "email" is filled out, proceed
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  //check if the email address is invalid
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  $mailcheck = spamcheck($_REQUEST['w_14']);
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  $w_1_check = $_REQUEST['w_1'];
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  $w_8_check = $_REQUEST['w_8'];
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  $w_13_check = $_REQUEST['w_13'];
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  if ($mailcheck==FALSE)
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    {
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    echo "<script language=\"JavaScript\">\r\n";
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    echo " alert(\"Please fill in a valid E-Mail so our staff can contact you. Thank you!\");\r\n";
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    echo " history.back();\r\n";
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    echo "</script>";
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    }
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          if ($w_1_check=='')
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    {
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    echo "<script language=\"JavaScript\">\r\n";
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    echo " alert(\"Please fill in the company name so our staff can contact you. Thank you!\");\r\n";
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    echo " history.back();\r\n";
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    echo "</script>";
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    }
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          if ($w_8_check=='')
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    {
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    echo "<script language=\"JavaScript\">\r\n";
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    echo " alert(\"Please fill in your name so our staff can contact you. Thank you!\");\r\n";
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    echo " history.back();\r\n";
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    echo "</script>";
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    }
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       if ($w_13_check=='')
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    {
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    echo "<script language=\"JavaScript\">\r\n";
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    echo " alert(\"Please fill in QQ/MSN number so our staff can contact you. Thank you!\");\r\n";
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    echo " history.back();\r\n";
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    echo "</script>";
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    }
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  else
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    {//send email
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    $email = $_REQUEST['w_14'] ;
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    $subject = $_REQUEST['w_1'] . " " . $_REQUEST['w_8'] ;
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    $message = "Company Name :". $_REQUEST['w_1'] . "\r\n" . "Website Languages :". $_REQUEST['w_2_1'] . "/" . $_REQUEST['w_2_2'] . "/" . $_REQUEST['w_2_3'] . "/" . $_REQUEST['w_2_4'] . "/" . $_REQUEST['w_2_5'] . "/" . "\r\n" . "Reference Sites :". $_REQUEST['w_3'] . "\r\n" . "Main Business :". $_REQUEST['w_4'] . "\r\n" . "Budget :". $_REQUEST['w_5'] . "-" . $_REQUEST['w_6'] . "\r\n" . "Completion Time :". "Expected date " . $_REQUEST['w_7'] . "\r\n" . "                  Expected days " . $_REQUEST['w_7_1'] . "\r\n" . "Other Requirements :". $_REQUEST['w_7_2'] . "\r\n" . "=============================================================" . "\r\n" . "Name :". $_REQUEST['w_8'] . "\r\n" . "Gender :". $_REQUEST['w_9'] . "\r\n" . "Phone :". $_REQUEST['w_11'] . "\r\n" . "Mobile :". $_REQUEST['w_12'] . "\r\n" . "QQ/MSN :". $_REQUEST['w_13'] . "\r\n" . "Email :". $_REQUEST['w_14'] . "\r\n" . "Skype :". $_REQUEST['w_15'] . "\r\n" . "Zip Code :". $_REQUEST['w_16'] . "\r\n" . "Address :". $_REQUEST['w_17'] . "\r\n";
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    mail("admin@zhaojian.net", "$subject Website Request Form",
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    $message, "From: $email");
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    echo "<script language=\"JavaScript\">\r\n";
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    echo "alert(\"Submission successful! Please wait for our staff to contact you. Redirecting to homepage.\");\r\n";
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    echo "location.replace(\"http://www.zhaojian.net/\");\r\n";
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    echo "</script>";
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    }
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  }
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else
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  {//if "email" is not filled out, display the form
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  echo "<form id='form1' action='http://www.zhaojian.net/b/b.php' method='post' name='form1'>
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    ...
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  </form>";
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  }
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?>
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</body>
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</html>
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