function menubuttonhover(name)
{
	Element.addClassName($(name + 'Button'), 'buttonhover');
	Element.addClassName($(name + 'Buttonimage'), 'buttonimagehover');
}
function menubuttonidle(name)
{
	Element.removeClassName($(name + 'Button'), 'buttonhover');
	Element.removeClassName($(name + 'Buttonimage'), 'buttonimagehover');
}

function menubuttonsubhover(name)
{
	Element.addClassName($(name), 'buttonsubhover');
}
function menubuttonsubidle(name)
{
	Element.removeClassName($(name), 'buttonsubhover');
}


function buttonsubbuttonhover(name)
{
	Element.addClassName($(name), 'buttonsubbuttonhover');
}
function buttonsubbuttonidle(name)
{
	Element.removeClassName($(name), 'buttonsubbuttonhover');
}

function buttonmoreinfohover(name)
{
	$(name).style.display="block";
}
function buttonmoreinfoidle(name)
{
	$(name).style.display="none";
}

function check_email()
{	
	var proceed = true;

	if (document.getElementById("Naam").value.length < 1){
		alert("Het veld: 'Naam' is niet ingevuld, dit veld is verplicht");
		proceed  = false;
	}

	if ((document.getElementById("Email").value.length < 1) || 
		(document.getElementById("Email").value.indexOf("@") == -1) ||
		(document.getElementById("Email").value.indexOf(".") == -1)){
		alert("Het veld: 'Email' is niet of onjuist ingevuld, dit veld is verplicht");
		proceed  = false;
	}

	if (document.getElementById("Onderwerp").value.length < 1){
		alert("Het veld: 'Onderwerp' is niet ingevuld, dit veld is verplicht");
		proceed  = false;
	}

	if (document.getElementById("Bericht").value.length < 1){
		alert("Het veld: 'Bericht' is niet ingevuld, dit veld is verplicht");
		proceed  = false;
	}
	
	if (proceed == true)
		document.forms[0].submit();
	
}