for making a dynamic field

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Javascript

PHP

hi folk
i am new to js please help me out.i am creating a field to enter date through js.when i click on calander a calader is opened and i can put date there.but clander is in a row fashion like it is linked to a table and when i will enter date it should store in table row.but for first row it is happening but when i enter in second row then date change reflect on first row date field.give some suggesation or if possible code.for reference i am also sending code for date field.

<form name="bid_date" action="products.php?sub_p_id=<?php print $row_sub_product['sub_p_id'];?>" method="post">
    <div>start date:<input type="text" name="start_date" value="<?php print $row_bid_create['start_date'];?>"/>
    <script language="JavaScript">
    new tcal ({
        // form name
        'formname': 'bid_date',
        // input name
        'controlname': 'start_date'
    });
    </script>
    </div>
    <div>end date:<input type="text" name="end_date" value="<?php print $row_bid_create['end_date'];?>"/>
    <script language="JavaScript">
    new tcal ({
        // form name
        'formname': 'bid_date',
        // input name
        'controlname': 'end_date'
    });
    </script>

here see controlname': 'start_date' this is common for all field so this is not working.so how to make it different for different field.