//validation of phone or fax number
//this function was copied from:
//www.webdevelopersjournal.com/articles/javascript_validate_form.html

function validPhone(pnumber) {
	var goodChars = "0123456789()-+ "
	var i
	if (isNaN(pnumber))
		{
		for (i=0; i<pnumber.length; i++)
			{
			if (goodChars.indexOf(pnumber.charAt(i))==-1)
				{
				return false ;
				}
			}
		}
	return true ;
}


//validation of email address
//this function was copied from:
//www.webdevelopersjournal.com/articles/javascript_validate_form.html

function validEmail (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) {
   return false
}

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


//validation of an id-number

function validID(id) {
	sum = 0 ;
	temp = 0 ;
	complete = 0 ;
	diff = 0 ;
	
	if (isNaN(id)) //onley numbers are allowed
		{
		return false ;
		}
		
	if (id.length != 9)  //must contains 9 digits
		{
		return false ;
		}

	//check control digit
	temp = Number(id.charAt(1)) * 2; // double digit in even place of the string
	if (temp >= 10)
		temp = Number(temp.toString().charAt(0)) + Number(temp.toString().charAt(1)); // add digits of result if bigger than 9
	sum += Number(id.charAt(0)) + temp; // add the digit in odd place with result to the total sum
	temp = Number(id.charAt(3)) * 2;
	if (temp >= 10)
		temp = Number(temp.toString().charAt(0)) + Number(temp.toString().charAt(1));
	sum += Number(id.charAt(2)) + temp;
	temp = Number(id.charAt(5)) * 2;
	if (temp >= 10)
		temp = Number(temp.toString().charAt(0)) + Number(temp.toString().charAt(1));
	sum += Number(id.charAt(4)) + temp;
	temp = Number(id.charAt(7)) * 2;
	if (temp >= 10)
		temp = Number(temp.toString().charAt(0)) + Number(temp.toString().charAt(1));
	sum += Number(id.charAt(6)) + temp;
	
	if (sum > 10)
	{
		complete = Number(sum.toString().charAt(0)) + 1; 
		complete *= 10; // next round number
	}
	else
		complete = 10;

	diff = complete - sum;
	if (diff == 10)
		diff = 0;
	
	if (id.charAt(8) == diff.toString())
		return true;
	
	return false;	

} // end of function validID