function IsWhiteSpace(char)
{
	if (char == " " || char == "\n" || char == "\t" || char == "\f" || char == "\r")
		return true;

	return false;
}

function IsDigit(char)
{	
	if(char == "0" || char == "1" || char == "2" || char == "3" || char == "4" || char == "5" || char == "6" || char == "7" || char == "8" || char == "9")
		return true;
		
	return false;
}

function IsBlank(str)
{
	for (index = 0; index < str.length; index++)
	{
		if (!IsWhiteSpace(str.charAt(index)))
			return false;
	}

	return true;
}

function Trim(str)
{
	for (fromIndex = 0; fromIndex < str.length; fromIndex++)
	{
		if(!IsWhiteSpace(str.charAt(fromIndex)))
			break;
	}

	for (toIndex = str.length; toIndex > fromIndex; toIndex--)
	{	
		if(!IsWhiteSpace(str.charAt(toIndex - 1)))
			break;
	}

	return str.substring(fromIndex, toIndex);
}

/*************************************************************/

function jshasInvalidCharacter(str)
{
	var oRegExp;
	oRegExp = new RegExp("[*^%=&\"'|<>]");
	
	if (oRegExp.test(str))
		return true;
	else
		return false;
}
/*************************************************************/
/*************************************************************/

function jscheckUrl(strUrl) 
{ 
 if (strUrl != "")
 {
   var len =strUrl.length
   if (len < 4)
   {
    alert ("Wrong URL entered")
    return false ;
   }
   else
   {
     var pos = strUrl.indexOf(".",0)
		 if ((pos == -1) | (pos == 0))
		 {
			alert("Wrong URL entered")
			return false ;  
		 }	
		 if (len-pos < 2)
		 {
			alert("Error in URL")
			return false ;	
		 }
   }
 }
} 



/************************************************************

function jscheckEmail(tstr) 
{


 if ((tstr.charCodeAt(0) < 49) | ((tstr.charCodeAt(0) > 90) & (tstr.charCodeAt(0) < 97)) |(tstr.charCodeAt(0) > 122))
 {
	
   //return false ;
 }
 var len = tstr.length
	if (len < 3)
	{
		return false ;
	} 
 else

 { 
	  

	var pos1 = tstr.indexOf("@",0)
	
	if ((pos1 == -1) | (pos1 == 0))
	{
	   
	  return false ;
	}  
	else
	{
	  if (pos1 < 1) 
		{
			return false ;
		}	
		pos1 = tstr.indexOf("@",pos1+1) 
		if (pos1 != -1) 
		{
			return false ;	
		}	
	}  
	var pos2 = tstr.indexOf(".",0)
	if ((pos2 == -1) | (pos2 == 0))
	{
		return false ;  
	}	
	if ((pos2-pos1 < 2) | (len-pos2 < 2))
	{
		return false ;	
	}	
 } 
 return true; 
}
**************************************************************/
/*************************************************************/


function jscheckEmail (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. */
	alert("Email address seems incorrect (check @ and .'s)")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid 

if (user.match(userPat)==null) {
    // user is not valid
    alert("The username doesn't seem to be 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) {
	        alert("Destination IP address is invalid!")
		return false
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("The domain name doesn't seem to be valid.")
    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.
   alert("The address must end in a three-letter domain, or two letter country.")
   return false
}

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

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