function show_colors(id, template){
	document.getElementById('portal_0'+id).style.backgroundImage = 'url(http://www.ivmi.nl/templates/'+template+'/images/voorkant_kleur_0'+id+'.gif)';
}
function hide_colors(id, template){
	document.getElementById('portal_0'+id).style.backgroundImage = 'url(images/'+template+'/images/voorkant_zw_0'+id+'.gif';
}

function show_module(id){
	var i = 1;
	while(document.getElementById('module_'+i) != null){
		if(i == id)
			document.getElementById('module_'+i).style.display = 'block';
		else
			document.getElementById('module_'+i).style.display = 'none';
		i++;
		}
}