function submitIt() {
		if	(emailCheck(document.getElementById("sender-email").value)== false){
 				return false;
		}else{
 			return true;
		}
	}
 
	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 +")*$")
	if ((document.getElementById("sender-email").value) == ""){
	alert ("Please enter your e-mail address.")
	return false;
	}

	if(emailStr.indexOf(",")>-1 || emailStr.indexOf(";")>-1){
		alert('You can only use multiple email addresses in the Recipients E-mail field.');
		return false;
	} 
 
		/* 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 email address 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;
 
	}