How to get column index from cell

Hello my question is:



How to get column index from cell, my code:



function eXcell_button(cell){

if (cell){

this.cell = cell;

this.grid = this.cell.parentNode.grid;

}

this.edit = function(){}

this.isDisabled = function(){ return false; }

this.setValue=function(val){

var row_id=this.cell.parentNode.idd;

this.setCValue("",val);



}

}

eXcell_button.prototype = new eXcell; // nest all other methods from base class



BUT GET UNDEFINED, WHAT IS THE PROPERTY THAT GIVE ME THE INDEX COLUMN?

var ind=this.cell.cellIndex gives you index of a column

Thanks !!!