how to check if somthing has been enter into a field by if statement

Ok I have a drop down box and I’m using the more fields plugin for word press to print out a http:// address that is entered on the post screen. The more fields plugin gives this code to print out the custom text field.

<?php meta('guys'); ?>

I need to check the custom fields to see if a address has been entered. If one has been entered it will show the in the drop down if not it will not show it. here is my code.

<form name="jump" >
<p align="left">
<select name="menu" style="width: 260px;">
<?php if(class_exists( 'guys') && meta('guys')) :?>
<option value="<?php echo meta('guys'); ?>">GUYS</option>
<?php endif; ?>
<?php if(class_exists( 'girls') && meta('girls')) :?>
<option value="<?php echo meta('girls'); ?>">Girls</option>
<?php endif; ?>
<?php if(class_exists( 'other') && meta('other')) :?>
<option value="<?php echo meta('other'); ?>">GUYS AND GIRLS</option>
<?php endif; ?>
</select>
<input type="button" onClick="location=document.jump.menu.options[document.jump.menu.selectedIndex].value;" value="GO" style="padding: 0px 5px;">
</p>
</form>

for some reason its not working even when i enter text for the field nothing shows up ?

http://wordpress.org/extend/plugins/more-fields/