jQuery Grid Plugin - jqGrid

Hello,I want use drag an drop but it doesn't work on IE6. I use jqgrid 3.6.4.

I create 3 grid and I want create 3 link betwenn all like this.

$(document).ready(function(){
    affichage_pour_demo_grid(); /* Permet d'affecter d'afficher la date de derniere mise a jour, l'envoi de mail et l'outil du developpeur*/
    $('#loading').hide();
    construc_grid_1();
    construc_grid_2();
    construc_grid_3();
    jQuery("#barre_nav1").jqGrid('gridDnD',{connectWith:'#barre_nav2,#barre_nav3'});
    jQuery("#barre_nav2").jqGrid('gridDnD',{connectWith:'#barre_nav1,#barre_nav3'});
    jQuery("#barre_nav3").jqGrid('gridDnD',{connectWith:'#barre_nav1,#barre_nav2'});
});

On IE6, drag and drog doesn't work I can select my row but I can't move it in other grid. And I Moziilla, when I move a row of the third grid to the first, le new row is empty and my data desapear?

Do you have an idea?

Thank you for your help.

Regards.

Missa