function trim(str) {
    return ltrim(rtrim(str), chars);
}

function ltrim(str) {
    chars = "\\s";
    return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str) {
    chars = "\\s";
    return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

function validateEMail(str) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   return reg.test(str);
}