function temp(form)
{
  var a = form.i1492.value ;

  var b = form.i1490.value ;

   var c = 0;
 
   var d = 0;
  
   var e = form.i1549.value ;

   var f = form.i1550.value ;

  c = ( ( b - a ) + ( e - f ) ) ;
  c = Math.round(c*100)/100;
  d = ( c / b ) * 100;
  d = Math.round(d);



  form.i1498.value = c;
  form.i1499.value = d + "%";
}