function sum_keypress(obj, evt) {
 if (document.all) key = evt.keyCode;
 else key = evt.which;
 if ((key >=  48  && key <=  57 ) || (key ==  8 ) || (key ==  127 ) || (key ==  13 )) {
  return true;
 }
 if (key ==  44 ) evt.keyCode = key =  46 ;
 if (key ==  46 ) {
  return String(obj.value).indexOf('.') <  0 ;
 }
 return false;
}
function integer_keypress(obj, evt) {
 if (document.all) key = evt.keyCode;
 else key = evt.which;
 if ((key >=  48  && key <=  57 ) || (key ==  8 ) || (key ==  127 ) || (key ==  9 ) || (key ==  13 )) return true;
 if (typeof(obj.canNegative) != "undefined" && key ==  45 ) {
  return String(obj.value).indexOf('-') <  0 ;
 }
 return false;
}