function MM_openBrWindow(theURL,winName,features)
{
	window.open(theURL,winName,features);
}

function changePlus(plusId)
{
	imgPlus = document.getElementById(plusId);
	if ( imgPlus.value == 1 )
	{
		imgPlus.src = 'http://www.neurofeedbackinstituutnederland.nl/minus.gif';
		imgPlus.value = 2;
	}
	else
	{
		imgPlus.src = 'http://www.neurofeedbackinstituutnederland.nl/plus.gif';
		imgPlus.value = 1;
	}
}