function getRequestParam(param)
{
   var url = document.location.toString();
   var pos = url.indexOf(param);

   if(pos > 0)
   {
     var s = url.substring(pos + param.length + 1, url.length);

     for(i = 0; i < s.length; i++)
     {
        if(s.charAt(i) == '&')
         {
            return s.substring(0, i);
         }
      }
      return s;
    }

    return null;
}

function checkForRequestResult(param, successMessage, failMessage)
{
    var p = getRequestParam(param);
    
    if(p != null)
    {
        alertSuccess(p, successMessage, failMessage);
    }

}

function alertSuccess(resultString, successMessage, failMessage)
{
  if('success' == resultString)
  {
     alert(successMessage);
     return;
  }
  alert(failMessage);
}

function openPopup(url, title, details)
{
	window.open(url, title, details);
}

function popUpHelpText(helpPageUrl)
{
	var width = 300;
	var height = 320;
	
	var top = (document.body.clientHeight/2) - (height/2);
	var left = (document.body.clientWidth/2) - (width/2);

	window.open(helpPageUrl, 'Help', 'left=' + left + ',top=' + top + ',width=' + width + ',height=' + height + ',menubar=no,status=no,toolbar=no');
}

function popUpHelp(url, width, height)
{
	popUp(url, 'Help', width, height);
}

function popUp(url, title, width, height)
{
	var top = (document.body.clientHeight/2) - (height/2);
	var left = (document.body.clientWidth/2) - (width/2);

	window.open(url, title, 'left=' + left + ',top=' + top + ',width=' + width + ',height=' + height + ',menubar=no,status=no,toolbar=no');
}

function fullPopUp(url, title)
{
	window.open(url, title, 'menubar=no,status=no,toolbar=no,left=0,top=0');
}

function detailedPopUp(url, title, details)
{
	window.open(url, title, details);
}

function popUp(url, title, width, height, args)
{
  var top = (document.body.clientHeight/2) - (height/2);
  var left = (document.body.clientWidth/2) - (width/2);

  var finalArgs = 'left=' + left + ',top=' + top + ',width=' + width + ',height=' + height;
  try
  {
     finalArgs = finalArgs + (args.length > 0?(',' + args):'');
  }catch(e){}

  window.open(url, title, finalArgs);
}

<!-- This script (email validation) and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- V1.1.3: Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
<!-- Original:  Sandeep V. Tamhankar (stamhankar@hotmail.com) -->

function emailCheck (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. */

alert("Email address seems incorrect (check @ and .'s)");
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) {
alert("Ths username contains invalid characters.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("Ths domain name contains invalid characters.");
return false;
   }
}

// 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.  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) {
alert("The domain name does not seem to be valid.");
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) {
alert("The address must end in a well-known domain or two letter " + "country.");
return false;
}

// Make sure there's a host name preceding the domain.

if (len<2) {
alert("This address is missing a hostname!");
return false;
}

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