How to mass remove specific text areas using batch processing?

I need to remove two text areas from A LOT of pdf files.
I am using batch processing with this script:

var fields = new Array();
for ( var i=0; i<this.numFields; i++)
{
var fname = this.getNthFieldName(i);
if ( this.getField(fname).type == "text" )
{
fields.push(fname);
}
}

for (var i=0; i<fields.length; i++)
{
this.removeField(fields[i]);
}

My problem is that it removes all text areas.
I do not know where to put the value so that it would only
remove two specific text areas.
One has a value Directions and the other one Directions2

Would you please help me?