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 isRadioButtonChecked(radButtons) {
	var checked = false;
    for (var i = 0; i < radButtons.length ; i++) {
       if ( radButtons[i].checked ) {  //alert ('Name checked='+radButtons[i].name+' Mand='+radButtons[i].mandatory)
		  checked = true;
          break;
       }   
    }      
	//alert ('Radio:'+radButtons.name+'='+checked);
	return checked;
}	
function getQnNr (fullLabel) {
  //return ( (Number(fullLabel.substr(1))/10  ) )
  return (fullLabel)
}

function verify(f)  {
  var msg = "";
  var empty_fields = "";
  var errors = "";
  var RadioListDone = new Array();
  for (var i=0; i<f.length; i++) {    
	var e = f.elements[i];		
    //alert (e.name+'/format='+e.format+'/typ='+e.type+'/val='+e.value);
	if (((e.type == "text") || (e.type == "textarea") || (e.type == "hidden")) && e.mandatory) {
      if ((e.value == null) || (e.value == "") || (isblank(e.value))) {
        empty_fields += "\n          Field " + e.name;
        continue;
      }	  
    }
	
    if (e.type == "radio") {  //	  alert (e.name+' is RADIO mandat?='+e.mandatory);
	  var aFound = false;
	  for (jj=0;jj<RadioListDone.length;jj++) {
		if (RadioListDone[jj]==e.name) { aFound = true; }
	  }  
	  if (!aFound) {
	    RadioListDone[RadioListDone.length+1] = e.name;  //alert (e.name+' added to list');
	    var radioFamily = document.getElementsByName(e.name); 	//alert (e.name+' IS '+radioFamily[0].mandatory);		
	    if ( (radioFamily[0].mandatory) && (!isRadioButtonChecked(radioFamily)) )	{		
		  empty_fields += "\n          Question " + getQnNr (e.name); 		  
		} 
	  }
	}
	
    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")&&(!emailCheck(e.value))) {
         errors += "- The field (" + getQnNr(e.name) + ") must be a correct e-mail address.\n";
      }else if ((e.format == "numerF")&&(!is_numeric_float(e.value))) {
		 errors += "- The field (" + getQnNr(e.name) + ") must be a correct float number.\n";
	  }else if ((e.format == "numerI")&&(!is_numeric_int(e.value))) {
		 errors += "- The field (" + getQnNr(e.name) + ") must be a correct integer.\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 (" + getQnNr(e.name) + ") must be select.\n";
    }  

    //Now check for checkbox
    if (e.format == "checkbox") {
	  if (!e.checked)
        errors += "- The checkbox (" + getQnNr(e.name) + ") must be checked.\n";
    }      	
    
	if ( (e.format == "dt_jjmmyy") && (e.mandatory)  && (!isDate(e.value, 'dd/MM/yy')) ) {
	   errors += "- The field (" + getQnNr(e.name) + ") must be a correct date dd/mm/yy.\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";
	msg += empty_fields + "\n";
    msg += "- are empty although mandatory\n";
	if (errors) msg += "\n";
  }
  msg += errors;
  alert(msg);
  return false;
}
function is_numeric_int(num){
	var sexp = new RegExp("^[0-9-.]*$","g");
	return sexp.test(num);
}

function is_numeric_float(number) {
	var reg = new RegExp("^[0-9]*[\.]?[0-9]*$","g");// equivalent "^[:digit:]+$"
	//var bCorrect = reg.test(number.value);
	return reg.test(number)
}


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;
}