Page number with 2 digits

Hello,

I have this code and my goal is get file name with pagenumber, but with two digits ike pdfname 01 pdfname 02... pdfname 09 pdfname 10

Thanks for your help

var nazev = this.documentFileName.replace(/.pdf/,"")

for (var p = 0; p < this.numPages; p++) { this.addWatermarkFromText({ cText: (nazev)+(p + 1 ), nHorizAlign: app.constants.align.center, nVertAlign: app.constants.align.bottom, nHorizValue: 10, nVertValue: 2, nFontSize: 10, nStart: p});

}