/*FUNCTION FOR THE EMAIL VALIDATIONS*/
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 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
         }
        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
         }
         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;
}