How do I cancel a condition to enter an e mail address in the box for sending a comment?

 

If i delete this in /item_comments_form.php:

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<label class="formEmail" for="commentEmail"><?php echo JText::_( 'E-mail' ); ?> *</label>

<input class="inputbox" type="text" name="commentEmail" id="commentEmail" value="<?php echo JText::_( 'enter your e-mail address...' ); ?>" onblur="if(this.value=='') this.value='<?php echo JText::_( 'enter your e-mail address...' ); ?>';" onfocus="if(this.value=='<?php echo JText::_( 'enter your e-mail address...' ); ?>') this.value='';" />

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box is hidden. But when I send a comment, a message displays that I have to fill out a required field.but which can not fill because they are hidden and the user sees.

 

thx for your help