get dropdown selected value and pass to another dropdown

Hi,
I have two dropdown and want to get the selected year value of the first one and add it to the url of the header page and also to the second dropdown url options so that when I select a php page from the second dropdown I can see the year value on the page.I past my code here but the selected year doesn't show on the php page. 



<form method="post">
        Report Period:
        <select name="mySelect" id="mySelect" onchange="'header.php?year='+this.value" >
            <option style="display:none;"> Select</option>-->

            <?php
          
            $result1 = mysql_query("select id,year from year_data where org_id=$org_id") or die(mysql_error());
          
            while ($row = mysql_fetch_assoc($result1)) {
            
                $period= $row['year'];
           
              $period_id=$row['id'];
           
                echo "<option  value=\"$period\">$period</option>";
              
            }
           
           
            ?>
       
        </select>
 Report Type:
        <select name="selectreport"  id="selectreport" > 

     
        <option style="display:none;">--Select--</option>
    
   
            <?php

           echo "<option value=\"".reportA.".php?org_id={$org_id}&year=".$_GET['year']."\">report A</option>";
            echo "<option value=\"" . reportB . ".php?org_id={$org_id}&year=".$_GET['year']."\">report B</option>";
        
            ?>

        </select>
        <input type=submit name=button method="post"  onClick="window.open(selectreport.value,
     'popUpWindow','height=800,width=1000,left=200,top=100,resizable=yes,scrollbars=yes,toolbar=yes,menubar=no,location=no,directories=no, status=yes');"value="view" >

    </form>

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