[SOLVED] Validating an Input Field

Right now I am using Javascript along with PHP to process a simple contact form. It works great but apparently some people think it is fun to press space bar on each input field to get around validation so i get alot of emails that are blank forms. So i would like to in turn put up some php programming to prevent empty fields and by empty that also means that pressing the space button          <---  see spacing would get around this issue. Please go to my contact form if you want to try it yourself and i will settle with a few emails: http://www.loonar.net/contact.php

I am assuming this is going to take the approach of using empty or something about testing a string? Any point in the right direction would be great ( a previous forum posting, examples, or just advice would be great. Thank you)

My code can be found here for the form ( i dont think you need the processing page but if you do ill post it in a reply)

Javascript validation but would like php to back up serverside if js is disabled:

<script>
								function checkcontactus() {
								if (document.forms.contactus.elements['fullname'].value.length == 0) {
									alert('Please enter a value for the "Your Name" field');
									return false;
								}


								if (document.forms.contactus.elements['email'].value.length == 0) {
									alert('Please enter a value for the "E-MAIL" field');
									return false;
								}
								  return true;
								}
								</script>

More Code:

[code]
						<td bgcolor="#FFFFFF" valign="top" width="493"><center><img src="images/welcome.jpg" width="485" height="21" border="0"></center>
							<p><span class="black">Please fill out all the information below and we will get back to you as quickly as possible.</span></p>
								<script>
								function checkcontactus() {
								if (document.forms.contactus.elements['fullname'].value.length == 0) {
									alert('Please enter a value for the "Your Name" field');
									return false;
								}


								if (document.forms.contactus.elements['email'].value.length == 0) {
									alert('Please enter a value for the "E-MAIL" field');
									return false;
								}
								  return true;
								}
								</script>
						<center><img src="images/hr.gif" width="480" height="10" border="0"></center><br>
						<form name="contactus" method="POST" action="email.php" onSubmit="return checkcontactus()">

							<center><table width="480" cellpadding="0" cellspacing="0" border="0">
								<tr>
									<td width="100" valign="middle"><p><span class="bold">Your Name:</span> </p></td>
									<td width="380"><p><input name="fullname" size="30">    *required field*</p></td>

								</tr>
							</table>
							<br>
							<table width="480" cellpadding="0" cellspacing="0" border="0">
								<tr>
									<td width="100" valign="middle"><p><span class="bold">Email:</span> </p></td>
									<td width="380"><p><input name="email" size="30">    *required field*</p></td>
								</tr>
							</table>
							<br>
							<table width="480" cellpadding="0" cellspacing="0" border="0">
								<tr>
									<td width="480" valign="middle"><center><p><span class="bold">Service or Request Desired:</span><br>
									<select size="1" name="service">
											<option value="No Request Selected">Please Choose a Request</option>
											<option value="Business Cards">Business Cards</option>
											<option value="Photo Retouch">General Question</option>
											<option value="Logo Design">Logo Design</option>
											<option value="Photo Retouch">Photo Retouching</option>
											<option value="Web Design">Web Design</option>
											<option value="Web Hosting">Web Hosting</option>
											<option value="Video Editing">Video Editing</option>
											<option value="Other">- Other -</option>
										</select></p></center></td>
								</tr>
							</table>
							<br>
							<table width="480" cellpadding="0" cellspacing="0" border="0">
								<tr>
									<td colspa valign="top"><center><p><span class="bold">Please explain the services you need in detail:</span></p></center></td>
								</tr>
								<tr>
									<td valign="top"><center><textarea cols="45" rows="7" name="other"></textarea></center></td>
								</tr>
							</table>
							<br>
							<table width="480" cellpadding="0" cellspacing="0" border="0">
								<tr>
									<td width="115"></td>
									<td width="150"><input type="submit" value="Request Information"></td>
									<td width="45"></td>
									<td width="100"><input type="reset" value-"Reset"></td>
									<td width="75"></td>
								</tr>
							</table></center>
							<br>
						</form>
						<p><span class="black">* Denote a Required Field - Please fill out all fields to submit form.</span>

[/code]

validate using: http://be.php.net/manual/en/book.ctype.php

filter using: http://be.php.net/manual/en/book.filter.php

bump*

if (empty(trim($_POST['text'])) {

  //blah blah blah

}

Thank You Dark!