function ChangeVis(formname, objectname, divname) {
	
	var mydiv = document.getElementById(divname);
	var mydiv2 = document.getElementById(divname + '2');
	
	if (document[formname][objectname].options[document[formname][objectname].selectedIndex].value == "OC") {
		mydiv.style.display = "block";
		mydiv2.style.display = "block";
	}
	else {
		mydiv.style.display = "none";
		mydiv2.style.display = "none";
	}

}