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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("<input type='button' value='"+val+"' onclick='abreHojaDatos("+row_id+","+cell.index+")'>",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 !!!!!