function product_details(prid) {
	window.open("collectie.php?prid=" + prid, "product", "width=780px,height=725px")
}

function image_details(prid, piid) 
{
	window.open("collectie.php?prid="+prid+"&piid="+piid, "image", "width=1px, height=1px");
}