I worked it out
With your actual input form the "name=" will have to be something like.. newchartpos_$i ..different for each input thing of course, aslong as it has
. Then also at the end add:
<form type="hidden" name="id_$i" value="$id">
Where $id being the value name you have associated with the id's of your rows.
Now for the php.
Okay thats just the basic ..you'll need to add more to suit yours.
Hopefully it'll work for you, i created it for mine, it only has a delete function and updating only one column of X amount of rows.