function EMail(s) {
		
	var a = false;
	var res = false;
	
	if(typeof(RegExp) == 'function') {
		var b = new RegExp('abc');
		if(b.test('abc') == true) {
			a = true;
		}
	}
	
	if(a == true) {
		reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+'(\\@)([a-zA-Z0-9\\-\\.]+)'+'(\\.)([a-zA-Z]{2,4})$');
		res = (reg.test(s));
	} else {
		res = (s.search('@') >= 1 &&
		s.lastendexOf('.') > s.search('@') &&
		s.lastendexOf('.') >= s.length-5)
	}
 
	return(res);
}