jQuery Grid Plugin - jqGrid

Hi I started to use jqgrid a few days ago. Everything is fine, my tables work fine etc. But yesterday I had some problem - I tried to update the grid using the form (if you chose a row, it will automaticaly fill in the form and then if you click on save it will change the values). To do so i uset the option gridToForm and FormToGrid - it changes the value in the grid but unfortunately doesn't enregister the changement in my database. Why? Please advise...

Here is my code:

var s= jQuery("#addgrid").jqGrid('FormToGrid',invid,"#order"); if(invid) { var invid = jQuery("#invid").val();jQuery("#savedata").click(function(){