function trim(value) {
	return value.replace(/^\s*/, "").replace(/\s*$/, "");
}

function is_numeric(value) {
   return (value - 0) == value && value.length > 0;
}

function email_check(email) {
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	if (reg.test(email)) return true;
	else return false;
}

function login_check(login) {
	var reg = /^[A-Za-z0-9_]{3,20}$/;
	if (reg.test(login)) return true;
	else return false;
}

function trim(string)
{
	return string.replace(/(^\s+)|(\s+$)/g, "");
}