<input type="text" name="coupon_code" size="20" maxlength="50" class="coupon"
alt="<?php echo $this->coupon_text ?>" value="<?php echo $this->coupon_text; ?>"
onblur="if(this.value=='') this.value='<?php echo $this->coupon_text; ?>';"
onfocus="if(this.value=='<?php echo $this->coupon_text; ?>') this.value='';" />
The textbox is not required to be filled in, so it is optional.