Hi Julian,
My mistake I forget to say you need to set an id.
in the listing form filter file where you put the new input you will see immediately before another input with a class of snear you also need to add an id of snear – so it looks like
<input name="snear" class="snear" id="snear" type="text" value="<?php echo $near;?>" onblur="if (this.value == '') {this.value = '<?php echo NEAR_TEXT;?>';}" onfocus="if (this.value == '<?php echo NEAR_TEXT;?>') {this.value = '';}" />
It needs the id for the jquery to pass the value to the form field.
Sorry
Kevin