function isblank(s)
   {
       for(var i = 0; i < s.length; i++) {
           var c = s.charAt(i);
           if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
       }
       return true;
   }
   
  function verifydata() {
      var en = document.getElementById("error");
      var pv = document.myform.propValue.value;
      if ((pv == null) || (pv == "")) {
          en.innerHTML = 'Property value cannot be left empty';
          return false;
      }
      var pvf = parseFloat(pv);
      if (isNaN(pvf) || pvf < 0) {
          en.innerHTML = 'Property value should be a valid number';
          return false;
      }
      var oo = document.myform.ownerOccupier.value;
      var nh = document.myform.newHouse.value;
      if (nh == 'true' && oo == 'true') {
          var pv1 = document.myform.sizeOfHouse.value;
          if ((pv1 == null) || (pv1 == "")) {
              en.innerHTML = 'Property size cannot be left empty';
              return false;
          }
          var pvf1 = parseFloat(pv1);
          if (isNaN(pvf1) || pvf1 < 0) {
              en.innerHTML = 'Property size should be a valid number';
              return false;
          }
          var pv2 = document.myform.siteValue.value;
          if ((pv2 == null) || (pv2 == "")) {
              en.innerHTML = 'Site value cannot be left empty';
              return false;
          }
          var pvf2 = parseFloat(pv1);
          if (isNaN(pvf2) || pvf2 < 0) {
              en.innerHTML = 'Site value should be a valid number';
              return false;
          }
      }
      return true;
   }