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;

}



function IsNumeric(sText)

{

   var ValidChars = "0123456789.";

   var IsNumber=true;

   var Char;



 

   for (i = 0; i < sText.length && IsNumber == true; i++) 

      { 

      Char = sText.charAt(i); 

      if (ValidChars.indexOf(Char) == -1) 

         {

         IsNumber = false;

         }

    }

   return IsNumber;

}



function checkDate(fld) {

    var mo, day, yr;

    var entry = fld.value;

    var reLong = /\b\d{1,2}[\/-]\d{1,2}[\/-]\d{4}\b/;

    var reShort = /\b\d{1,2}[\/-]\d{1,2}[\/-]\d{2}\b/;

    var valid = (reLong.test(entry)) || (reShort.test(entry));

    if (valid) {

        var delimChar = (entry.indexOf("/") != -1) ? "/" : "-";

        var delim1 = entry.indexOf(delimChar);

        var delim2 = entry.lastIndexOf(delimChar);

        mo = parseInt(entry.substring(0, delim1), 10);

        day = parseInt(entry.substring(delim1+1, delim2), 10);

        yr = parseInt(entry.substring(delim2+1), 10);

        // handle two-digit year

        if (yr < 100) {

            var today = new Date( );

            // get current century floor (e.g., 2000)

            var currCent = parseInt(today.getFullYear( ) / 100) * 100;

            // two digits up to this year + 15 expands to current century

            var threshold = (today.getFullYear( ) + 15) - currCent;

            if (yr > threshold) {

                yr += currCent - 100;

            } else {

                yr += currCent;

            }

        }

        var testDate = new Date(yr, mo-1, day);

        if (testDate.getDate( ) == day) {

            if (testDate.getMonth( ) + 1 == mo) {

                if (testDate.getFullYear( ) == yr) {

                    // fill field with database-friendly format

                    fld.value = mo + "/" + day + "/" + yr;

                    return true;

                } else {

                    alert("There is a problem with the year entry.");

                }

            } else {

                alert("There is a problem with the month entry.");

            }

        } else {

            alert("There is a problem with the date entry.");

        }

    } else {

        alert("Incorrect date format. Enter as mm/dd/yyyy.");

    }

    return false;

}