Create a javascript data validation function

I need to adjust a javascript function to validate the inserted number for HTML form field "PE" --> function CheckIEPE(ie) in [login to view URL], based on the PDF document. This needs to be done because the existing code for "PE" does not work correctly. If the number is typed correctly, the html form does not do anything, if the value is wrong it displays a alert box: "Inscrição estadual errada." Some valid numbers for PE field: 415322448 250329689 240514890 434839256 006879799 043616364 034661328 043260756 016672542 030760089 001147315 026457966