red background alert not triggered for email field

I have a contactus.php page created using your contact form solution pack. When a user tabs away from each required field without entering anything, in addition to displaying the error message, the backgrounds of the text fields turn red to alert the user, except for the email field. The red warning color does not appear in this field. How do I fix this so the red background color appears in the email field as well when the user tabs past this field without entering email address? thanks so much!

here's the code in contactus.php for the email text box:

<label for="Email_address" >E-mail address:</label>
<br />
<span id="sprytextfield2">
<input name="Email_address" type="text" class="inputValue" id="Email_address" onblur="if (document.getElementById('emailServerError')) document.getElementById('emailServerError').style.display='none'" value="<?php echo(ValidatedField("contact","Email_address")) ?>" />
<span class="textfieldRequiredMsg">A value is required.</span><span class="textfieldInvalidFormatMsg">Invalid format.</span></span>
<input name="seconddblock" id="seconddblock" type="text" style="display:none" value="" />
<?php
if (ValidatedField("contact","contact")) {
if ((strpos((",".ValidatedField("contact","contact").","), "," . "2" . ",") !== false || "2" == "")) {
if (!(false)) {
?>
<span id="emailServerError" class="textfieldServerError">Please provide your email addess so we can get back in touch with you.</span>
<?php //WAFV_Conditional contact.php contact(2:)
}
}
}?>