function show_tab(nr){
	var tabarray= new Array("detail_algemeen","detail_techniek", "detail_veiligheid", "detail_interieur");
	var divarray= new Array("alg","tech", "veil", "int_ext");

	for(i=0; i<divarray.length; i++){
		if(divarray[i] == nr){
			document.getElementById(nr).style.display="block";
			document.getElementById(tabarray[i]).className="activedetail";
			document.getElementById(tabarray[i]).blur();
			
		} else {
			document.getElementById(divarray[i]).style.display="none";
			document.getElementById(tabarray[i]).className="";
		}
	}
}