function checkListUser ( form ) {
	//alert(form.listee_email.value);
	//email validation
	validemail=emailCheck(new String(form.listee_email.value));
	if(validemail==false){
		alert("Woops. That email doesn't look right to me.");
		return false;
	}
	
	
	return true;
}

function isNumber(str){
	if (isNaN(parseInt(str))) {
	    alert("Phone number contains illegal characters."); 
		return false;
	}
	return true;
}

function validChars(strng){
	// allow only letters, numbers, periods, @ and underscores
	strng=strng.replace(" ", "");
	var valid_chars=/[^a-zA-Z0-9@._\-\']/; //_.@-\
	if (!valid_chars.test(strng)) {return true;} // alert("valid -- " + strng);
	else {return false;} //alert("invalid -- " + strng);
}

function validLength(strng, min_len, max_len){
	if ((strng.length < min_len) || (strng.length > max_len)) {
	    return false;
	}
	return true;
}

function emailCheck (emailStr) {
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|c oop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	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 provide a valid email address.");
		return false;
	}

	var user=matchArray[1];
	var domain=matchArray[2];
	
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			//alert("Please provide a valid email address.");
			return false;
		}
	}
	
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			//alert("Please provide a valid email address.");
			return false;
		}
	}
	
	if (user.match(userPat)==null) {
		//alert("Please provide a valid email address.");
		return false;
	}
	
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
			//alert("Please provide a valid email address.");
			return false;
			}	
		}
		return true;
	}

	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			//alert("Please provide a valid email address.");
			return false;
		}
	}
	
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		//alert("Please provide a valid email address.");
		return false;
	}

	if (len<2) {
		//alert("Please provide a valid email address.");
		return false;
	}
	return true;
}