function emailCheck(emailStr) {
	var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'
	var word="(" + atom + "|" + quotedUser + ")"
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]

	// See if "user" is valid
	if (user.match(userPat)==null) {
	    return false
	}
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
	    // this is an IP address
		  for (var i=1;i<=4;i++) {
		    if (IPArray[i]>255) {
			return false
		    }
	    }
	    return true
	}
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
	    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) {
	   return false
	}

	// Make sure there's a host name preceding the domain.
	if (len<2) {
	   var errStr="This address is missing a hostname!"
	   return false
	}

	// If we've gotten this far, everything's valid!
	return true;
}
	var numRepEmpty = 0;
	
	
	function checkValidMail(num){
	  //console.log(num + ':' + numRepEmpty);
		var name = document.getElementById("recipientname" + num);
		var mail = document.getElementById("recipientemail" + num);
		
		if (name.value == "" && mail.value == "") {
			numRepEmpty++;
			return true;
		}
		
		if (name.value == "" && mail.value != "") {
			name.focus();
			alert("Please enter name for recipent " + num);
			return false;
		}
		
		if (name.value != "" && (mail.value == "" || !emailCheck(mail.value))){
			mail.focus();
			alert("Please enter valid email for recipent " + num);
			return false;
		}
		
		return true;
	}
	
	function validateSend(){
		var recaptcha = document.getElementById("recaptcha_response_field");
		if (recaptcha){
			if (recaptcha.value == ""){
				alert("Please enter the validation code");
				return false;
			}
		}
		return true;
	}
	function validate(){
		numRepEmpty = 0;
		
		if (!checkValidMail(1)) return false;
		if (!checkValidMail(2)) return false;
		if (!checkValidMail(3)) return false;
		if (!checkValidMail(4)) return false;
		
		if (numRepEmpty==4) {
			alert("Please enter at least one recipent!");
			return false;
		}
		
		senderName = document.getElementById("yourname");
		senderMail = document.getElementById("youremail");
		
		if (senderName.value == ""){
			senderName.focus();
			alert("Please enter your name");
			return false;
		}
		if (senderMail.value == "" || !emailCheck(senderMail.value)){
			senderMail.focus();
			alert("Please enter your valid email address");
			return false;
		}
		
		var form = document.getElementById("myForm");
		form.submit();
	}