/**
 * Validates that input's value is correct email address
 */
function validateEmail(elem) {
  var str = "";
  if(elem.value){
    str = new String(elem.value);
  }else{
    str = new String(elem);
  }
  if (window.RegExp) {
    var reg1str = "(@.*@)|(\\.\\.)|(@\\.)|(\\.@)|(^\\.)";
    var reg2str = "^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,4})(\\]?)$";
    var reg1 = new RegExp(reg1str);
    var reg2 = new RegExp(reg2str);
    if (!reg1.test(str) && reg2.test(str)) {
      return true;
    }
    return false;
  } else {
    if(str.indexOf("@") >= 0)
      return true;
    return false;
  }
}