function isEmail(s) {
	if (s.length > 50)	return false;
	if (s.indexOf("'")!=-1 || s.indexOf("/")!=-1 || s.indexOf("\\")!=-1 || s.indexOf("<")!=-1 || s.indexOf(">")!=-1) return false;
    //edit by liujy 2004-08-04 09:30:01 
    s = s.replace('(', '');
    s = s.replace(')', '');
    s = s.replace('£¨', '');
    s = s.replace('£©', '');

	var regu = "^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[_.0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+(.+)$";
	//{2}|net|NET|com|COM|gov|GOV|mil|MIL|org|ORG|edu|EDU|int|INT|cn|CN|cc|CC
	var re = new RegExp(regu);
	if (s.search(re) != -1)
		return true;
	else
		return false;
}


function isNameStr(s) {
	if (s.length > 50)	return false;

	var regu = "^([0-9|a-z|A-Z|_|-|.|@|-]{3,50})$";
	var re = new RegExp(regu);
	if (s.search(re) != -1)
		return true;
	else
		return false;
}

function isPwsStr(s) {
	if (s.length > 50)	return false;

	var regu = "^([0-9|a-z|A-Z|_]{4,20})$";
	var re = new RegExp(regu);
	if (s.search(re) != -1)
		return true;
	else
		return false;
}