document.write('<form name="searchform" method="get" action="/trade/search.php" target="_top">'
+'产品供求：<input type="text" size="12" name="keyword" class="input" value=""> '
+'<select name="tradetype" class="input">'
+'<option value="">买卖方向</option>'
+'<option value="1">求购</option>'
+'<option value="2">供应</option>'
+'<option value="3">合作</option>'
+'<option value="4">代理</option>'
+'</select> '
+'<input height=15 name="Submit" src="/img/go.gif" style="border-bottom: medium none; border-left: medium none; border-right: medium none; border-top: medium none" type="image" width="45">'
+'</form>');