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 is_filledup(aValue, aLabel) {
  if (aValue == "") {
    alert("Field " + aLabel + " is mandatory. (" + aValue + ")");
	return false;
  }
  else  return true;
}
function isvalid_email(afield ) {// version simplifiee
if ((afield.indexOf('@',0)==-1 || afield.indexOf('.',0)==-1))  {
       alert("Email address needs sign '@' and '.',  correct your email address.");
	return (false);}
 else return (true);
}

function isRadioButtonChecked(radioButton) {
var checked = false;
   for (var i = 0; i < radioButton.length ; i++) {
       if ( radioButton[i].checked ) {
          checked = true;
          break;
       }   
    }      
	return checked;
}	

function verify(f)
{ var arrRadios = Array ();
  var msg = "";
  var empty_fields = "";
  var errors = "";
  for (var i=0; i<f.length; i++) {
    var e = f.elements[i];
	//if (e.mandatory) alert (e.name+' is mandat')
    //first check if the field is empty
    if (((e.type == "text") || (e.type == "textarea") || (e.type == "hidden")) && e.mandatory) {
      if ((e.value == null) || (e.value == "") || (isblank(e.value))) {
        empty_fields += "\n          " + e.name;
        continue;
      }
    }
	
	//if (e.name == "selUOffTown") alert ('selUOffTown='+e.type)
    if (e.type == "select-one") {
	  if (e.selectedIndex == 0 )
	    empty_fields += "\n          " + e.errLabel;
	}
	if (e.type == "radio") {
	  obj = document.getElementsByName(e.name)
	  if (!isRadioButtonChecked(obj)) {
	    found=false; xx = 0;
		while (!found && (xx<arrRadios.length) ) {
		  found = ( arrRadios[xx]==e.name )
		  xx++
		}
		if (!found) { //alert (e.name+' NOT checked')
		  arrRadios[arrRadios.length] = e.name;	
		  empty_fields += "\n          " + e.errLabel;		
		}
	  }
	}
	
	if ((e.value != null) && (!isblank(e.value))) {
      //Now check for fields that are supposed to be numeric
      if (e.numeric || (e.min != null) || (e.max != null)) {
        var v = parseFloat(e.value);
        if (isNaN(v) || ((e.min != null) && (v < e.min)) || ((e.max != null) && (v > e.max))) {
          errors += "- The field " + e.name + " must be a number";
          if (e.min != null)
            errors += " that is greater than " + e.min;
          if (e.max != null && e.min != null)
            errors += " and less than " + e.max;
          else if (e.max != null)
            errors += " that is less than " + e.max;
          errors += ".\n";
        }
      }

      //Now check for fields that are supposed to be formatted
      if (e.format == "email") {
        if (!emailCheck(e.value))
          errors += "- The field " + e.name + " must be a correct e-mail address.\n";
      }
	  if (e.format == "date_dd_mm_yyyy") {
        if (!dateCheck_dd_mm_yyyy(e.value))
          errors += "- The field " + e.name + " must be a correct date.\n";
      }
	  if ( (e.format == "date") || (e.format == "date_yyyy_mm_dd") ) {
        if (!dateCheck(e.value))
          errors += "- The field " + e.name + " must be a correct date.\n";
      }
    }

    //Now check for combo list
    if (e.format == "combo") {
      if (e.options[e.selectedIndex].text == '' || e.options[e.selectedIndex].text == '0')
        errors += "- The combo " + e.name + " must be select.\n";
    }  

    //Now check for checkbox
    if (e.format == "checkbox") {
      if (!e.checked)
        errors += "- The checkbox " + e.name + " must be checked.\n";
    }      	
       
  }
  if (!empty_fields && !errors) return true;
  msg +=     "_________________________________________________________\n\n";
  msg += "The form was not submitted because of the following error(s).\n";
  msg += "Please correct these error(s) and re-submit.\n";
  msg +=     "_________________________________________________________\n\n";
  if (empty_fields) {
    msg += "- The following required field(s) are empty:" + empty_fields + "\n";
    if (errors) msg += "\n";
  }
  msg += errors;
  alert(msg);
  return false;
}

function dateCheck (dateStr) {
  var datePat=/^2\d{3}-\d{2}-\d{2}$/;
  var matchArray=dateStr.match(datePat)
  if (matchArray==null) {
	return false;
  }
  var mm = parseInt(dateStr.substr(5,2));
  if ((mm<0)||(mm>12))
    return false;
  var jj = parseInt(dateStr.substr(8,2));
  if ((jj<0)||(jj>31))
    return false;
 
  return true;
}

function dateCheck_dd_mm_yyyy (dateStr) {
  var datePat=/^\d{2}-\d{2}-2\d{3}$/;
  var matchArray=dateStr.match(datePat)
  if (matchArray==null) {
	return false;
  }
  var mm = parseInt(dateStr.substr(3,2));
  if ((mm<0)||(mm>12))
    return false;
  var jj = parseInt(dateStr.substr(0,2));
  if ((jj<0)||(jj>31))
    return false;
 
  return true;
}

function emailCheck (emailStr) {
/* The following pattern is used to check if the entered e-mail address
   fits the user@domain format.  It also is used to separate the username
   from the domain. */
var emailPat=/^(.+)@(.+)$/
/* The following string represents the pattern for matching all special
   characters.  We don't want to allow special characters in the address. 
   These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
/* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]"
/* The following pattern applies if the "user" is a quoted string (in
   which case, there are no rules about which characters are allowed
   and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
   is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
   rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
   e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
/* The following string represents an atom (basically a series of
   non-special characters.) */
var atom=validChars + '+'
/* The following string represents one word in the typical username.
   For example, in john.doe@somewhere.com, john and doe are words.
   Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
/* The following pattern describes the structure of a normal symbolic
   domain, as opposed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


/* Finally, let's start trying to figure out if the supplied address is
   valid. */

/* Begin with the coarse pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    return false
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
		return false
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
    return false
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 ) {//||  domArr[domArr.length-1].length>3
   // the address must end in a two letter or three letter word.
   return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   var errStr="This address is missing a hostname!"
   return false
}

// If we've gotten this far, everything's valid!
return true;
}