function checkform(frm1)
{
    if (!check_empty(document.frm1.Email.value))
    { 
		validity = false; alert('Please enter your Email Address'); 
		frm1.Email.focus();
		frm1.Email.select();
		return false;
	}	
    if (!isEmail(document.frm1.Email.value))
    { 
		validity = false; alert('Please enter a valid Email Address'); 
		frm1.Email.focus();
		frm1.Email.select();
		return false;
    }
}
//--------------------------------------------------------------

function check_empty(text)
{
	  return (text.length > 0); // returns false if empty
}

function isEmail(str) {
  var supported = 0;
  if (window.RegExp) {
    var tempStr = "a";
    var tempReg = new RegExp(tempStr);
    if (tempReg.test(tempStr)) supported = 1;
  }
  if (!supported) 
    return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
  return (!r1.test(str) && r2.test(str));
}