/* Changes:  Sandeep V. Tamhankar (stamhankar@hotmail.com) */

/* 1.1.2: Fixed a bug where trailing . in e-mail address was passing
            (the bug is actually in the weak regexp engine of the browser; I
            simplified the regexps to make it work).
   1.1.1: Removed restriction that countries must be preceded by a domain,
            so abc@host.uk is now legal.  However, there's still the 
            restriction that an address must end in a two or three letter
            word.
     1.1: Rewrote most of the function to conform more closely to RFC 822.
     1.0: Original  */

/* This script and many more are available free online at */
/* The JavaScript Source!! http://javascript.internet.com */

//----------------------------------------------------------------------

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
}

	/* 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;
}

function check(req) {
	if ((req.brochure.checked) || (req.heating.checked) || (req.cooling.checked) || (req.ventilation.checked) || (req.refrigeration.checked) || (req.maintenance.checked) || (req.systems.checked) || (req.airquality.checked)) {
	} else {
		alert("Please request a free brochure or a free estimate.");
		return false;
	}
	if (req.name.value == "") {
		alert("Please fill in your name.");
		return false;
	} else if (req.company.value == "") {
		alert("Please fill in your company/organization name.");
		return false;
	} else if ((req.address1.value == "") || (req.city.value == "") || (req.state.selectedIndex == 0) || (req.zip.value == "")) {
		alert("Please complete your address information.");
		return false;
	} else if (req.email.value != "") {
		 if (emailCheck(req.email.value)) {
		 	req.submit();
		 } else {
		 	return false;
		 }
	} else {
		req.submit();
	}
}