function emailCheck (emailStr, isCheck) {
	var field = 'Email';
	if (isCheck) field = 'Confirmation Email';
//	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(field+" 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(field+": 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(field+": Destination IP address is invalid!")
				return false
		    }
	    }
	    if (isCheck && emailStr != document.getElementById('email').value){
//	    	alert('The Email and Confirmation Email inserted are different!');
	    	return false;
	    }
	    return true
	}

	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
//		alert(field+": 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(field+": 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=field+": This address is missing a hostname!"
	   alert(errStr)
	   return false
	}

	if (isCheck && emailStr != document.getElementById('email').value){
//		alert('The Email and Confirmation Email inserted are different!');
		return false;
	}
	// If we've gotten this far, everything's valid!
	return true;
}