function isspace(c) {	
    return (c==' ') || (c=='\t') || (c=='\n') || (c=='\r');
}

function trim(s) {
    while ((s.length > 0) && isspace(s.charAt(0)))
			s = s.substr(1,s.length-1);
    while ((s.length > 0) && isspace(s.charAt(s.length-1)))
			s = s.substr(0,s.length-1);
    return s;
}

function isEmail(s) {
    return (s.length >= 5) && (s.indexOf("@") >= 1) && (s.indexOf(".") >= 1);
}