function myswitch(id){
	myimg = "img_"+id;

	if (document.getElementById(id).style.display == "none") {
		document.getElementById(id).style.display = "";
		document.getElementById(myimg).src = "pix/arrow_down.gif";
	}
	else {
		document.getElementById(id).style.display = "none";
		document.getElementById(myimg).src = "pix/arrow_right.gif";
	}
}