function checkEmail(field){if(isObject(field)){var str=field.value;var reg1=/(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/;var reg2=/^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/;if(!reg1.test(str)&&reg2.test(str))return true;alert("\""+str+"\"is an invalid e-mail!");return false;}}
function isObject(obj){if(null==obj)return false;if("undefined"==typeof(obj))return false;return true;}