/**
 * Validates that input's value is correct email address
 */
function validateEmail(elem) {
    var str = "";
    if (elem.value) {
        str = new String(elem.value);
    } else {
        str = new String(elem);
    }

    if (window.RegExp) {
        var reg1str = "(@.*@)|(\\.\\.)|(@\\.)|(\\.@)|(^\\.)";
        var reg2str = "^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,4}|[0-9]{1,4})(\\]?)$";
        var reg3str = "\"([^\"]+)\"\\s+<{1}([A-z]{1}[A-z0-9\\x2d\\.]*[A-z0-9]{1}@[A-z0-9\\x2d\\.]*[A-z-9]{1}\\.[A-z]{2,5})>{1}";
        var reg1 = new RegExp(reg1str);
        var reg2 = new RegExp(reg2str);
        var reg3 = new RegExp(reg3str);
        if (!reg1.test(str) && (reg2.test(str) || reg3.test(str))) return true;
        return false;
    } else {
        if (str.indexOf("@") >= 0) return true;
        return false;
    }
}
String.prototype.trim = function() {
    return this.replace(/(^\s*)|(\s*$)/g, "");
}

/**
 * returns string with all leading and trailing characters 
 * eliminated.
 */
function trim(str){
  var s = new String(str);
  //trailing spaces
  while (s.length>0 && isSpaceCharacter(""+s.charAt(s.length-1))){
    s = s.substring(0,s.length-1);
  }
  //leading spaces
  while (s.length>0 && isSpaceCharacter(""+s.charAt(0))){
    s = s.substring(1);
  }
  return s
}

var spaces = " \t\r\n"+String.fromCharCode(160);

function isSpaceCharacter(ch){
  return spaces.indexOf(ch) >-1;
}

function isEmpty(elem){
  return trim(elem.value).length==0;
}

function validateForm(){
  if(f.email){
      if(!f.alreadyreg.checked){
          if(isEmpty(f.firstname)){
            alert("Please enter first name");
            f.firstname.focus();
            return false;
          }
          if(isEmpty(f.lastname)){
            alert("Please enter last name");
            f.lastname.focus();
            return false;
          }
      }
      if(!isEmpty(f.email) && !validateEmail(f.email)){
        alert("Please enter valid email address");
        f.email.focus();
        return false;
      }
      if(!f.alreadyreg.checked){
          if(f.email.value!=f.confirmemail.value){
            alert("Email addresses do not match");
            f.confirmemail.focus();
            return false;
          }
          if(isEmpty(f.password)){
            alert("Please enter password");
            f.password.focus();
            return false;
          }
          if(isEmpty(f.confirmpassword)){
            alert("Please confirm password");
            f.confirmpassword.focus();
            return false;
          }
          if(f.password.value!=f.confirmpassword.value){
            alert("Passwords do not match");
            f.confirmpassword.focus();
            return false;
          }
          if(isEmpty(f.login)){
            alert("Please enter online name");
            f.login.focus();
            return false;
          }
      }
  }
  if(isEmpty(f.quest)){
            alert("Please enter your question");
            f.quest.focus();
            return false;
          }
  f.submit();
}

function showFields(x){
  for(var i=1;i<10;i++){
    var fil = document.getElementById('field'+i);
    if(fil!=null){
      if(x.checked){
        fil.style.display='none';
      }else{
        fil.style.display='block';
      }
    }
  }
}