// JavaScript Document

//validate email address

function checkemail(str) {
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
  var isOK = !r1.test(str) && r2.test(str);
  if (!isOK)
  	alert('Invalid Email!');
  return isOK;
 }