function build(btype,parameter)
{
//***********************************************************************
//*
//* Function  build--look up table for building properties
//*
//* Language:  JavaScript1.1
//*
//* Inputs:
//*   object   form object
//*
//* Returns:
//*   none
//*
//* Limitations:
//*   
//*   
//*
//* Author:
//*  Dr. Fred Tillman
//*  National Research Council Research Associate
//*  Regulatory Support Branch
//*  Ecosystems Research Division
//*  National Exposure Research Laboratory
//*  United States Environmental Protection Agency
//*  960 College Station Road
//*  Athens, Georgia 30605
//*  tillman.fred@epa.gov
//* 
//*
//* Reference:
//*  Flanagan, D., 1997, JavaScript: The Definitive Guide, 2ed, O'Reilly and Associates
//*
//* Created: 3-30-2004
//*
//* Required functions: none
//*
//* Required scripts: none
//*
//***********************************************************************
  
//* Building parameters taken from Appendix G, Table G-13 of the OSWER Draft Guidance on Vapor Intrusion
//* Eb(building air exchange rate)[hr^-1]; Hb(slab-on-grade mixing height)[m]
//* Fb(building footprint area)[m2]; Ab(TOTAL foundation area including buried walls)[m2]
//* eta(slab-on-grade building crack ratio); Lcrack(slab thickness)[m]
//* deffcrack (effective diffusion coefficient of slab crack, set equal to unsat deff)[cm2/s]

   var Eb = 0; var Ab = 0; var Fb = 0; var Lcrack = 0; var Hb = 0; var eta = 0; var bname='';

      if (btype =='none') { Eb = '';   Ab = '';  Fb = ''; Lcrack = '';  Hb = '';   eta = '';}
 else if (btype =='base') { bname = 'Basement'; Eb = 0.25; Fb = 100; Ab = 180; Lcrack = 0.1; Hb = 3.66; eta = 0.0002;}
 else if (btype =='slab') { bname = 'Slab-on-Grade'; Eb = 0.25; Fb = 100; Ab = 106; Lcrack = 0.1; Hb = 2.44; eta = 0.00038;}



if (parameter == 'Eb'){return Eb;}
if (parameter == 'Fb'){return Fb;}
if (parameter == 'Ab'){return Ab;}
if (parameter == 'Lcrack'){return Lcrack;}
if (parameter == 'Hb'){return Hb;}
if (parameter == 'eta'){return eta;}
if (parameter == 'bname'){return bname;}

}