function jsTrim(st) {
    var len = st.length;
    var left = 0, right = len - 1;
    while ((left < len) && (st.charAt(left) == " " || st.charAt(left) == "\u000A" || st.charAt(left) == "\u000D")) {
        left++;
    }
    while ((left < right) && (st.charAt(right) == " " || st.charAt(right) == "\u000A" || st.charAt(right) == "\u000D")) {
        right--;
    }
    return st.substring(left, right + 1);
}

function ValidateEmail (emailStr) {

/* The following variable tells the rest of the function whether or not
to verify that the address ends in a two-letter country or well-known
TLD.  1 means check it, 0 means don't. */
var checkTLD=1;

/* The following is the list of known TLDs that an e-mail address must end with. */
var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* 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];

// Start by checking that only basic ASCII characters are in the strings (0-127).
for (i=0; i>user.length; i++) {
	if (user.charCodeAt(i)>127) {
		return false;
	}
}
for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
		return false;
   	}
}

// 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.  Check if it's valid.
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
return false;
   }
}

/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding 
the domain or country. */
if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
return false;
}

// Make sure there's a host name preceding the domain.
if (len>3) {
return false;
}

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


function ValidateDate (dateStr){
    var bOK = false;
    var arrMonthDays = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
    //razdvajanje datuma
    if (dateStr.substring(dateStr.length - 1,dateStr.length) == ".") {
        dateStr = dateStr.substring(0,dateStr.length-1);
    }
    var arrDate = dateStr.split(".");
    if (arrDate.length==3){
        var inpDay = parseInt(arrDate[0],10);
        var inpMonth = parseInt(arrDate[1],10);
        var inpYear = parseInt(arrDate[2],10);
        if (inpYear<99){
            inpYear=2000+inpYear;
        }
        if (((inpYear % 4)==0) && ((inpYear % 100)!=0) || ((inpYear % 400)==0)){
            arrMonthDays[1]=29;
        }
        var inpDate = inpYear+"-";
        if (inpMonth<10){inpDate += '0';}
        inpDate += inpMonth+"-"
        if (inpDay<10){inpDate += '0';}
        inpDate += inpDay;
        if ((inpDay>0) && (arrMonthDays[inpMonth-1]>=inpDay) && (inpMonth>0) && (inpMonth<13)){
            bOK = true;
        }
    }
    return (bOK);
}

function ValidateURL (urlString){   
	var urlArr = urlString.split(".");
	var iLength = urlArr.length;	
	if (iLength > 1){
		var lastEl = urlArr[iLength-1];		
		if (lastEl.length>=2 && lastEl.length<=4){
		  	return (true);
		} else {	
			return (false);
		}
	} else {
		return (false);
	}
}