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.lastIndexOf('.') > s.search('@') &&
				s.lastIndexOf('.') >= s.length-5)
	}
	return(res);
}