function alertMessage() {
	alert (
			'De velden gemarkeerd\n'+
			'met een * zijn verplicht.\n' +
			'Vul deze aub in.' 
		);
	
}

function validate(form) {

	switch(form.id) {
		
	///////// CONTACT ///////////////////////////
	/////////////////////////////////////////////

		case 'contact':

			if (
			document.forms[0].Bedrijfsnaam.value == "" ||
			document.forms[0].Contactpersoon.value == "" ||
			//document.forms[2].address.value == "" ||
			//document.forms[2].number.value == "" ||		
			//document.forms[2].zipcode.value == "" ||
			document.forms[0].tel.value == "" ||
			document.forms[0].email.value == "" ){		
				alertMessage();
				return(false);
			}
			// check radio button gender
			else if (contactformulier.gender[0].checked == false && 
			contactformulier.gender[1].checked == false){
				alertMessage();
				return(false);
			}
		return(true);
		
	///////// BROCHURE ///////////////////////////
	/////////////////////////////////////////////

		case 'brochure':

			if (
			document.forms[2].initials.value == "" ||
			document.forms[2].lastname.value == "" ||
			document.forms[2].address.value == "" ||
			document.forms[2].number.value == "" ||		
			document.forms[2].zipcode.value == "" ||
			document.forms[2].town.value == "" ){			
				alertMessage();
				return(false);
			}
			// check radio button gender
			else if (brochureformulier.gender[0].checked == false && 
			brochureformulier.gender[1].checked == false){
				alertMessage();
				return(false);
			}
		return(true);	
		
	///////// PROSPECTUS ///////////////////////////
	/////////////////////////////////////////////

		case 'prospectus':

			if (
			document.forms[2].initials.value == "" ||
			document.forms[2].lastname.value == "" ||
			document.forms[2].address.value == "" ||
			document.forms[2].number.value == "" ||		
			document.forms[2].zipcode.value == "" ||
			document.forms[2].town.value == "" ){			
				alertMessage();
				return(false);
			}
			// check radio button gender
			else if (prospectusformulier.gender[0].checked == false && 
			prospectusformulier.gender[1].checked == false){
				alertMessage();
				return(false);
			}
		return(true);	
		
	///////// OP DE HOOGTE ///////////////////////////
	/////////////////////////////////////////////

		case 'opdehoogte':

			if (
			document.forms[2].initials.value == "" ||
			document.forms[2].lastname.value == "" ||
			//document.forms[2].address.value == "" ||
			//document.forms[2].number.value == "" ||		
			//document.forms[2].zipcode.value == "" ||
			//document.forms[2].town.value == "" ||
			document.forms[2].email.value == "" ){			
				alertMessage();
				return(false);
			}
			// check radio button gender
			else if (opdehoogteformulier.gender[0].checked == false && 
			opdehoogteformulier.gender[1].checked == false){
				alertMessage();
				return(false);
			}
		return(true);			
		
	///////// INSCHRIJVEN //////////////////////
	/////////////////////////////////////////////
	
		case 'inschrijven':

			if (
			document.forms[2].amount.value == "" ||
			document.forms[2].initials.value == "" ||
			document.forms[2].lastname.value == "" ||
			document.forms[2].address.value == "" ||
			document.forms[2].number.value == "" ||
			document.forms[2].zipcode.value == "" ||
			document.forms[2].town.value == "" ||
			document.forms[2].tel.value == "" ){
				alertMessage();
				return(false);
			}
			// CHECK GENDER
			else if (inschrijven.gender[0].checked == false && 
			inschrijven.gender[1].checked == false){
				alertMessage();
				return(false);
			}
			// CHECK SECOND BANK ACCOUNT OWNER
			else if (inschrijven.secondowner[0].checked == true) {
				
				//// CHECK GENDER SECOND OWNER
				if (
				inschrijven.gender2[0].checked == false && 
				inschrijven.gender2[1].checked == false){
					alertMessage();
					return(false);
				}
				//// CHECK INITTIAL AND LASTNAME SECOND OWNER
				else if (
				document.forms[2].initials2.value == "" ||
				document.forms[2].lastname2.value == "" ){
					alertMessage();
					return(false);
				}
			}
			// CHECK WHETHER SUBSCRIPTION VIA COMPANY
			else if (inschrijven.viacompany[0].checked == true) {
				if (
				document.forms[2].companyname.value == "" ){
					alertMessage();
					return(false);
				}				
			}
		return(true);
			
	///////// TELL A FRIEND ///////////////////////////
	/////////////////////////////////////////////

		case 'tellafriend':

			if (
			document.forms[0].sName.value == "" ||
			document.forms[0].sEmail.value == "" ||
			document.forms[0].rName.value == "" ||
			document.forms[0].rEmail.value == "" ){		
				alertMessage();
				return(false);
			}
		return(true);
		
	///////// CALL ME NOW //////////////////////
	/////////////////////////////////////////////
	
		case 'callmenow':

			if (
			document.forms[1].cmnInitials.value == "" ||
			document.forms[1].cmnName.value == "" ||
			document.forms[1].cmnTel.value == "" ){		
				alertMessage();
				return(false);
			}
			/*check radio button gender
			else if (contactformulier.gender[0].checked == false && 
			contactformulier.gender[1].checked == false){
				alertMessage();
				return(false);
			}*/ 
		return(true);
	
			//end of switch
	}	
}