как в модуле mod_jshopping-search вместо кнопки "Поиск" поставить иконку "поиск"? - Дизайн и оформление

<input class="btn" type = "submit" value = "<?php print _JSHOP_GO?>" />

<script type = "text/javascript">
function isEmptyValue(value){
    var pattern = /\S/;
    return ret = (pattern.test(value))? (true) : (false);
}
</script>
<form name = "searchForm" method = "post" action="<?php print SEFLink("index.php?option=com_jshopping&controller=search&task=result", 1);?>" onsubmit = "return isEmptyValue(jQuery('#jshop_search').val())">

<div class="input-append">
<input type="hidden" name="setsearchdata" value="1">
<input type = "hidden" name = "category_id" value = "<?php print $category_id?>" />
<input type = "hidden" name = "search_type" value = "<?php print $search_type;?>" />
<input type = "text" class = "inputbox" style = "width: 110px" name = "search" id = "jshop_search" value = "<?php print $search?>" />
<input class="btn" type = "submit" value = "<?php print _JSHOP_GO?>" /></div>



<?php if ($adv_search) {?>
<br /><a href = "<?php print $adv_search_link?>"><?php print _JSHOP_ADVANCED_SEARCH?></a>
<?php } ?>
</form>