function IsEmailValid(oEmail){email=oEmail.value; r1=new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");r2=new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$");return(!r1.test(email)&&r2.test(email))}