function validateEmail(emailAddress) {

		var sAt = "@";
		var sDot = ".";
    var sSpace = " ";
		var posAt = emailAddress.indexOf(sAt);
		var lenStr = emailAddress.length;
		var posDot = emailAddress.indexOf(sDot);
    var posSpace = emailAddress.indexOf(sSpace);

		if ((posAt == -1 || posAt == 0 || posAt == (lenStr - 1)) ||
		    (posDot == -1 || posDot == 0 || posDot == (lenStr - 1)) ||
        (emailAddress.charAt(lenStr - 1) == sDot) ||
		    (emailAddress.indexOf(sAt, (posAt  + 1)) != -1) ||
		    (emailAddress.substring(posAt - 1, posAt) == sDot || emailAddress.substring(posAt + 1, posAt + 2) == sDot) ||
		    (emailAddress.indexOf(sDot, (posAt + 2)) == -1) ||
		    (posSpace != -1))
    {
		   return false;
		}

 		 return true;			
	}