function validatenewsletter() {

	if (document.frmNewsletter.first_name.value=="") {
	alert("Please, enter your first name!");
	document.frmNewsletter.first_name.focus();
	return false;
	}

	if (document.frmNewsletter.last_name.value=="") {
		alert("Please, enter your last name!");
		document.frmNewsletter.last_name.focus();
		return false;
	}

	if (emailCheck(document.frmNewsletter.email_address.value) == false ) {
		return false;
	}

}

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) {
    	alert("Please, enter a valid email address!")
		document.frmNewsletter.email_address.focus();
		return false;
	}
	var user=matchArray[1]
	var domain=matchArray[2]

	if (user.match(userPat)==null) {
    	alert("Please, enter a valid email address!")
		document.frmNewsletter.email_address.focus();
    	return false;
	}

	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
	  	for (var i=1;i<=4;i++) {
	    	if (IPArray[i]>255) {
	        	alert("Please, enter a valid email address!")
				document.frmNewsletter.email_address.focus();
				return false;
	    	}
    	}
    	return true;
	}
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		alert("Please, enter a valid email address!")
		document.frmNewsletter.email_address.focus();
    	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) {
   		alert("Please, enter a valid email address!");
		document.frmNewsletter.email_address.focus();
   		return false;
	}
	if (len<2) {
   		var errStr="Please, enter a valid email address!"
		document.frmNewsletter.email_address.focus();
   		alert(errStr);
   		return false;
	}

return true;

}