function Calculate() {
  // Ensure that no fields are blank...
  
  if(document.CALCFORM.LENGTH_FEET.value == "")
    document.CALCFORM.LENGTH_FEET.value = "0";
  if(document.CALCFORM.LENGTH_INCHES.value == "")
    document.CALCFORM.LENGTH_INCHES.value = "0";    
    
  if(document.CALCFORM.WIDTH_FEET.value == "")
    document.CALCFORM.WIDTH_FEET.value = "0";    
    
  if(document.CALCFORM.WIDTH_INCHES.value == "")
    document.CALCFORM.WIDTH_INCHES.value = "0";   
  if(document.CALCFORM.DEPTH_INCHES.value == "")
    document.CALCFORM.DEPTH_INCHES.value = "0";     
  // Determine length in inches...
  var len_in = parseInt(document.CALCFORM.LENGTH_FEET.value) * 12 + 
               parseInt(document.CALCFORM.LENGTH_INCHES.value);
  // Determine width in inches...
  var wid_in = parseInt(document.CALCFORM.WIDTH_FEET.value) * 12 + 
               parseInt(document.CALCFORM.WIDTH_INCHES.value);
  // Depth should be in inches already...
  var dep_in = parseInt(document.CALCFORM.DEPTH_INCHES.value);
  
  // Calculate area in square feet
  var area = len_in * wid_in / 144;             
  
  // Calculate volume in cubic feet
  var volume = len_in * wid_in * dep_in / 1728;
  
  // Calculate volume in cubic yards
  var cub_yards = volume / 27;  
  
  // Print calculations to corresponding text boxes
  document.CALCFORM.TOTAL_AREA.value = Math.round(1000*area)/1000;
  document.CALCFORM.TOTAL_VOLUME.value = Math.round(1000*volume)/1000;
  document.CALCFORM.CUBIC_YARDS.value = Math.round(1000*cub_yards)/1000;
}