function calculate_total_shades()
 {
   var ttl = 0;
   var hgt = document.forms['calc_shades']['height'].value;
   var wid = document.forms['calc_shades']['width'].value;

   ttl = ((hgt * wid)/144)*15;
   ttl_l = ttl*.94
   ttl_h = ttl*1.06
   document.getElementById('total_l').value=ttl_l;
   document.getElementById('total_h').value=ttl_h;


 } // end function definition
 
 function calculate_total_art()
 {
   var ttl = 0;
   var hgt = document.forms['calc_art']['height'].value;
   var wid = document.forms['calc_art']['width'].value;


   ttl = ((hgt * wid)/144)*25;
   ttl_al = ttl*.97
   ttl_ah = ttl*1.03
   document.getElementById('total_al').value=ttl_al;
   document.getElementById('total_ah').value=ttl_ah;

 } // end function definition
 
 function calculate_total_walls()
 {
   var ttl = 0;
   var hgt = document.forms['calc_walls']['height'].value;
   var wid = document.forms['calc_walls']['width'].value;


   ttl = ((hgt * wid)/144)*8.5;
   ttl_wl = ttl*.95
   ttl_wh = ttl*1.05
   document.getElementById('total_wl').value=ttl_wl;
   document.getElementById('total_wh').value=ttl_wh;


 } // end function definition