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function dropsort() {
	var browser = document.sort_form.sort.value;
	location.href = browser
}

<form name="sort_form" class="view_sp">
	<select name="sort" onchange="dropsort()">
		<option value="#lnk_patio">中庭-PATIO-(パティオ)</option>
		<option value="#lnk_shop">SHOP</option>
		<option value="#lnk_banq_l">大宴会場</option>
		<option value="#lnk_banq_s">小宴会場</option>
	</select>
</form>