if you want to give your column a different name, you can use:
function bg_method()
{
var _rowindex = arguments[0]
var _isSelected = arguments[1]
var _field_type = arguments[2]
var _field_name = arguments[3]
var _form_name = arguments[4]
var _state = arguments[5]
var _dataProviderName = forms[_form_name].elements[_field_name].getDataProviderID()
if(_state[_dataProviderName] == null)
{
return "#FF0000"
}
if(_isSelected)
{
return "#FFFFCC"
}
else
{
if(_rowindex % 2 == 0)
{
return "#DCDCDC"
}
else
{
return "#F2F2F2"
}
}
}