//Email Validation
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. */
	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 Email id 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;
}  

  
//String Validation
function vString(vStr,vMsg,vSpl)
  {
  // Name Validation
    var str = trim(vStr);
	if (str == "")
	 {
       alert("\n " + vMsg + " !!!");
	   return false;
	 }
	     
     for (var i = 0; i < str.length; i++) 
	   {
		 var ch = str.substring(i, i + 1);
		 if (vSpl==0)
		 {
		     if (((ch < "a" || "z" < ch) && (ch < "A" || "Z" < ch)) && (ch != '.') && (ch != ' '))
 			  {
 			    alert("\n " + vMsg + " !!!");
			    return false;
			  }
		 }
		 else
		 {
		     if (((ch < "a" || "z" < ch) && (ch < "A" || "Z" < ch)) && (ch != '.') && (ch != ' ') && (ch != '-') && (ch != ',') && (ch != ';') && (ch != ':') && (ch != '(') &&(ch != ')') && (ch < "0" || "9" < ch) && (ch.charCodeAt(0)!=13) && (ch.charCodeAt(0)!=10))
 			  {
			  	alert(ch.charCodeAt(0));
 			    alert("\n " + vMsg + " !!!");
			    return false;
			  }
		  }
	  }
 //return SplChar();
	return true;
}

//Number Validation
function vNumber(vStr,vMsg,vEmpty,vDec,vSpl) {
   	var str = trim(vStr);
	//var valid = true;
	if ((vDec==0)&&(vSpl==1))
	{
		var GoodChars = "0123456789()-+ ";
	}
	else if((vDec==1)&&(vSpl==1))
	{
		var GoodChars = "0123456789()-+. ";
	}
	else if((vDec==0)&&(vSpl==0))
	{
		var GoodChars = "0123456789";
	}
	else if((vDec==1)&&(vSpl==0))
	{
		var GoodChars = "0123456789.";
	}

	var i = 0;
	if ((str=="" && vEmpty==0) || (str==" " && vEmpty==0)) {
	// Return false if number is empty
		alert("\n " + vMsg + " !!!");
		return false;
	}
	for (i =0; i <= str.length -1; i++) 
		{
		if (GoodChars.indexOf(str.charAt(i)) == -1) 
			{
				alert("\n " + vMsg + " !!!");
				return false;
			} 
		} 
	return true;
}

//Trim Empty Spaces
function trim(inputString)
 {
   if (typeof inputString != "string") { return inputString; }
   var retValue = inputString;
   var ch = retValue.substring(0, 1);
   while (ch == " ") { // Check for spaces at the beginning of the string
      retValue = retValue.substring(1, retValue.length);
      ch = retValue.substring(0, 1);
   }
   ch = retValue.substring(retValue.length-1, retValue.length);
   while (ch == " ") { // Check for spaces at the end of the string
      retValue = retValue.substring(0, retValue.length-1);
      ch = retValue.substring(retValue.length-1, retValue.length);
   }
   while (retValue.indexOf("  ") != -1) { // Note that there are two spaces in the string - look for multiple spaces within the string
      retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length); // Again, there are two spaces in each of the strings
   }
   return retValue; // Return the trimmed string back to the user
}