function initMenuItemEvents(partID, hoverClassName)
{
	var part = document.getElementById(partID);
	var area = part.getElementsByTagName('AREA').item(0);
	area.onmouseover = function()
	{
		part.className = hoverClassName;
	};
	area.onmouseout = function()
	{
		part.className = null;
	};
}

function changeImage(partID, imgSRC)
{
	var part = document.getElementById(partID);
	var area = part.getElementsByTagName('AREA').item(0);
	var image = part.getElementsByTagName('IMG').item(0);
	var oldVal = image.src;
	area.onmouseover = function()
	{
		image.src = imgSRC;
	};
	area.onmouseout = function()
	{
		image.src = oldVal;
	};
}

function initMenu()
{
	initMenuItemEvents('werk_studie', 'werk_studie_hover');
	initMenuItemEvents('dyslexie_studie', 'dyslexie_studie_hover');
	initMenuItemEvents('visuele_beperking_thuis', 'visuele_beperking_thuis_hover'); 
	
	changeImage('bottom_image_link', 'images/home_platen/visuele_beperking_onderweg_overlay.jpg' );
}

if ( window.addEventListener )
{
	window.addEventListener('load', initMenu, false);
}
else if ( window.attachEvent )
{
	window.attachEvent('onload', initMenu);
}