function trim(str)
{
 return str.replace(/^[\s\xA0]+/, '').replace(/[\s\xA0]+$/, '').replace(/ +$/, '').replace(/^ +/, '');
}

function isEmail(email)
{
 var pattern = /^[-._A-Za-z0-9]{1,}@[-._A-Za-z0-9]{1,}\.[A-Za-z]{2,4}$/;
 return pattern.test(email);
}