// Decimal fraction check
function checkNumber(elementName) {
  var arv = elementName.value;
  if (arv.indexOf(',')!=-1) {
    arv = arv.substring(0, arv.indexOf(','))+'.'+arv.substring(arv.indexOf(',')+1, arv.length);
    elementName.value = arv;
  }
  var i;
  var hadpoint = 0;
  var ch = '';
  var chprev = '';
  for (i=0; i<arv.length; i++) {
    ch = arv.substring(i, i+1);
    if (((ch<'0' || ch>'9') && ch!='.' && ch!='-') || 
        (ch=='-' && (i>0 || arv.length<=1)) || 
        (ch=='.' && (chprev=='-' || i==0 || i==arv.length-1))) {
      window.alert('Number sisestatud ebakorrektselt!');
      elementName.value = "";
      elementName.select();
      break;
    }
    else {
      if (hadpoint==1 && ch=='.') {
        window.alert('Number sisestatud ebakorrektselt!');
        elementName.value = "";
        elementName.select();
        break;
      }
      else {
        if (ch=='.') {
          hadpoint = 1;
        }
      }
    }
    chprev = ch;
  }
}

// Integer check
function checkInteger(elementName) {
  var arv = elementName.value;
  var i;
  var ch = '';
  for (i=0; i<arv.length; i++) {
    ch = arv.substring(i, i+1);
    if (ch<'0' || ch>'9') {
      window.alert('Number sisestatud ebakorrektselt!');
      elementName.value = "";
      elementName.select();
      break;
    }
  }
}