function getRadioValue (radioButtonOrGroup) {
  var value = null;
  if (radioButtonOrGroup.length) { // group 
    for (var b = 0; b < radioButtonOrGroup.length; b++)
      if (radioButtonOrGroup[b].checked)
        value = radioButtonOrGroup[b].value;
  }
  else if (radioButtonOrGroup.checked)
    value = radioButtonOrGroup.value;
  return value;
}

function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}
	
	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	return result;
}

function validEmail(formField,fieldLabel,required)
{
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Please enter a complete email address in the form: yourname@yourdomain.com");
		formField.focus();
		result = false;
	}
   
  return result;

}

function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}


function validInt(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var num = parseInt(formField.value,10);
 		if (isNaN(num))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}


function validDate(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var elems = formField.value.split("/");
 		
 		result = (elems.length == 3); // should be three components
 		
 		if (result)
 		{
 			var day = parseInt(elems[0],10);
  			var month = parseInt(elems[1],10);
 			var year = parseInt(elems[2],10);
			result = allDigits(elems[1]) && (day > 0) && (day < 32) &&
					 allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}
 		
  		if (!result)
 		{
 			alert('Please enter a date in the format DD/MM/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 
	
	return result;
}

//verschillende forms controleren

function validateFormContact(theForm)
{	
	if (!validInt(form.nr,"Menu Number",true))
		return false;
	
	return true;
}

function validateFormTraining(theForm)
{		
	if (!validRequired(ShowType.name,"Name"))
		return false;	
	if (!validRequired(ShowType.company,"Company"))
		return false;
	if (!validEmail(ShowType.email,"Email"))
		return false;
	if (!validRequired(ShowType.tel,"Telephone"))
		return false;
	if (!validRequired(ShowType.fax,"Fax"))
		return false;	
	if (!validRequired(ShowType.persons,"Number of Persons"))
		return false;
	
	return true;
}

function validateFormLuncheon(theForm)
{

	if (!validRequired(luncheon.company,"Company"))
		return false;
	if (!validRequired(luncheon.address,"Address"))
		return false;
	if (!validRequired(luncheon.city,"City"))
		return false;
	if (!validRequired(luncheon.state,"State"))
		return false;
	if (!validRequired(luncheon.zipcode,"Zip Code"))
		return false;
	if (!validRequired(luncheon.tel,"Telephone"))
		return false;		
	if (!validRequired(luncheon.years,"Years in Business"))
		return false;
	if (!validRequired(luncheon.employees,"Employees"))
		return false;
		
	if (!validRequired(luncheon.fname1,"First Name"))
		return false;
	if (!validRequired(luncheon.lname1,"Last Name"))
		return false;
	if (!validRequired(luncheon.position1,"Position"))
		return false;
	if (!validRequired(luncheon.email1,"E-Mail"))
		return false;
		
	if (!((luncheon.fname2.value=="") && (luncheon.lname2.value==""))){
		if (!validRequired(luncheon.fname2,"First Name"))
			return false;
		if (!validRequired(luncheon.lname2,"Last Name"))
			return false;
		if (!validRequired(luncheon.position2,"Position"))
			return false;
		if (!validRequired(luncheon.email2,"E-Mail"))
			return false;
	}
	
	if (!(luncheon.LunchDate[0].checked || luncheon.LunchDate[1].checked)) {
		alert("Please select a luncheon session");
		return false;
		}
		
		
	return true;
	}	
	
function validateFormPassword(theForm)
{	
	if (!validRequired(Password_form.name,"Name"))
		return false;
	if (!validRequired(Password_form.company,"Company"))
		return false;
	if (!validRequired(Password_form.address,"Address"))
		return false;
	if (!validRequired(Password_form.city,"City"))
		return false;
	if (!validRequired(Password_form.state,"State"))
		return false;
	if (!validRequired(Password_form.country,"Country"))
		return false;
	if (!validEmail(Password_form.email,"Email"))
		return false;
	if (!validRequired(Password_form.tel,"Telephone"))
		return false;
	if (!validRequired(Password_form.fax,"Fax"))
		return false;
		
		return true;
	}	
	
function validateFormDownloads(theForm)
{	
	if (!validRequired(download.name,"Name"))
		return false;
	if (!validRequired(download.company,"Company"))
		return false;	
	if (!validEmail(download.email,"Email"))
		return false;
	if (!validRequired(download.tel,"Telephone"))
		return false;
	if (!validRequired(download.fax,"Fax"))
		return false;
		
		return true;
	}	
function validateFormDownloads2(theForm)
{	
	if (!validRequired(download.name,"Name"))
		return false;
	if (!validRequired(download.company,"Company"))
		return false;	
	if (!validEmail(download.email,"Email"))
		return false;
	if (!validRequired(download.user,"User Id"))
		return false;
		
		return true;
	}	
	


function validateFormContact(theForm)
{	
	if (!validRequired(Contact.name,"Name"))
		return false;
	if (!validRequired(Contact.company,"Company"))
		return false;
	if (!validEmail(Contact.email,"Email"))
		return false;
	if (!validRequired(Contact.address,"Address"))
		return false;
	if (!validRequired(Contact.city,"City"))
		return false;
	if (!validRequired(Contact.country,"Country"))
		return false;
	if (!validRequired(Contact.tel,"Telephone"))
		return false;
	if (!validRequired(Contact.fax,"Fax"))
		return false;
		
	return true;
}

function validateFormSupport(theForm)
{	
	if (!validRequired(Support.name,"Name"))
		return false;
	if (!validRequired(Support.company,"Company"))
		return false;
	if (!validEmail(Support.email,"Email"))
		return false;
	if (!validRequired(Support.tel,"Telephone"))
		return false;
	//if (!validRequired(Support.fax,"Fax"))
	//	return false;
	if (!validRequired(Support.type,"Type"))
		return false;

			
	return true;
}

function validateFormJobs(theForm)
{	
	if (!validRequired(Jobs.name,"Name"))
		return false;
	if (!validRequired(Jobs.address,"Address"))
		return false;
	if (!validEmail(Jobs.email,"Email"))
		return false;
	if (!validRequired(Jobs.tel,"tel"))
		return false;
	if (!validRequired(Jobs.education,"Eduaction"))
		return false;
	
	return true;
}

function validateFormNumber(theForm)
{	
	if (!validInt(form.nr,"Menu Number",true))
		return false;
	
	return true;
}



function validateFormEvents(theForm)
{
	if (!validDate(form.from,"Date From",true))
		return false;
		
	if (!validDate(form.untill,"Date untill",true))
		return false;
			
	return true;
}

function validateForm(theForm)
{
	
	if (!validRequired(form.nl,"Dutch"))
		return false;
		
	if (!validRequired(form.en,"English"))
		return false;
	
	if (!validRequired(form.fr,"French"))
		return false;
		
	if (!validRequired(form.de,"German"))
		return false;
	
	if (!validRequired(form.es,"Spanish"))
		return false;
	
	return true;
}