不用js用php做tab选项卡

1.根据get判断，获取get生成css

<style type="text/css">
<?php 
    if(!isset($_GET['city_id']))
    {
        $city_id = 12;
    }
    else
    {
        $city_id = $_GET['city_id'];
    }
    echo '.a'.$city_id.'
    {
        color:red;
    }
    ';    
    
    
    for($i=12;$i<=16;$i++)
    {
        if($i != $city_id)
        {
            if ($i != 12 )
            {
                echo '.list'.$i.'{
                    background-image:url("image/style/bg.gif");
                }';
            } 
            else
            {
                echo '.list'.$i.'
                {
                    background-image:url("image/style/left_bg.gif");
                }
                ';
            }
        }
        else
        {
            if($city_id != 12)
            {
                echo '.list'.$city_id.'
                {
                    background-image:url("image/style/on.gif");
                }
                ';            
            }else
            {
                echo '.list'.$city_id.'{
                    background-image:url("image/style/recuit_title.gif");
                }';
            }    
        }    
    }
    

?>
</style>

2.点击的时候，就可以打开链接

<div class="recuit_title" >
		<ul id="recuit_li">
			<li class="list12"><a class="a12" href="test.php?city_id=12">北京</a></li>
			<?php
				include_once ("config/db.inc.php");
				$recuit_city_select = "select * from cdb_plugins_city where city_id in(13,14,15,16)";
				$recuit_city_query = mysql_query ( $recuit_city_select );
				while ( $recuit_city_row = mysql_fetch_assoc ( $recuit_city_query ) ) {
					$cid = $recuit_city_row['city_id'];
					echo '<li class="list'.$recuit_city_row['city_id'].'" ><a class="a'.$recuit_city_row['city_id'].'" href="test.php?city_id=' . $recuit_city_row ['city_id'] . '">' . $recuit_city_row ['city_name'] . '</a></li>';
				}
			?>
		</ul>
		<span class="more_recuit_info">
			<a href="../job.php?action=recuit_list&cid=12" onClick="parent.showWindow('recuit_list',this.href);return false;">更多招募信息</a>
		</span>
		</div>
		<div class="recuit_content">
		<table width="100%">
		<?php
			if(!$_GET['city_id'])
			{
				
				$recuit_content_select  = "select * from cdb_plugins_recuit where city_id= 12 limit 0,8";
				$recuit_content_query  = mysql_query($recuit_content_select);
				while($recuit_content_row = mysql_fetch_assoc($recuit_content_query))
				{
					echo '<tr height="25">
							<td>
								<a onclick="parent.showWindow('.'\'recuit_info\','.'this.href'.');return false;"'.'" href="../job.php?action=recuit_info&recuit_id='.$recuit_content_row['recuit_id'].'">'.$recuit_content_row['recuit_name'].'</a>
							</td>
						  	<td width="80" align="right" style="color:#0080ff;font-size:12px;">
						  		'.$recuit_content_row['username'].'  
						  	</td>
						  </tr>';
				}
			}
			else
			{
				$recuit_content_select  = "select * from cdb_plugins_recuit where city_id={$_GET['city_id']} limit 0,10";
				$recuit_content_query  = mysql_query($recuit_content_select);
				while($recuit_content_row = mysql_fetch_assoc($recuit_content_query))
				{
					echo '<tr>
							<td><a onclick="parent.showWindow('.'\'recuit_info\','.'this.href'.');return false;"'.'" href="../job.php?action=recuit_info&recuit_id='.$recuit_content_row['recuit_id'].'">'.$recuit_content_row['recuit_name'].'</a></td>
						  	<td width="80" align="right" style="color:#0080ff;font-size:12px;">'.$recuit_content_row['username'].'  </td>
						</tr>';
				}
			}
		?>		
		</table>
		</div>
		<div class="recuit_footer">
			<?php 
				include_once ("../include/common.inc.php");
				$recuit_query = mysql_query("select * from cdb_plugins_recuit_userinfo where uid=$discuz_uid");
				$recuit_rows = mysql_fetch_assoc($recuit_query);
				if($recuit_rows['uid'] == '')
				{
					echo '<a href="../job.php?action=recuit" onclick="parent.showWindow('.'\'recuit\''.',this.href);return false;"><img src="image/style/recuit_frm_input.gif" border="0" /></a>  ';	
				}
				else
				{
					echo '<a href="../job.php?action=edit_recuit" onclick="parent.showWindow('.'\'edit_recuit\''.',this.href);return false;"><img src="image/style/edit_recuit.gif" border="0"/><a>  ';
				}
			?>		
		</div>