function selecopt(id) {
//get id of selected element
var element = document.getElementById(id);
var elemopt = id + "opt";

if (element.getAttribute("id") == "sidepanel"){
	if(element.checked == true){
		document.forms['productoptions'].elements['AddOn4'].disabled = false;
		document.forms['productoptions'].elements['AddOn5'].disabled = false;
		document.forms['productoptions'].elements['AddOn7'].disabled = true;
		document.forms['productoptions'].elements['AddOn2'].disabled = true;
		document.forms['productoptions'].elements['Color'].disabled = true;
		document.getElementById(elemopt).style.display = "block";
	}
	else {
		document.forms['productoptions'].elements['AddOn4'].disabled = true;
		document.forms['productoptions'].elements['AddOn5'].disabled = true;
		document.getElementById(elemopt).style.display = "none";
	}
}
else if(element.getAttribute("id") == "doorpanel"){
	if(element.checked == true){
		document.forms['productoptions'].elements['AddOn7'].disabled = false;
		document.forms['productoptions'].elements['AddOn4'].disabled = true;
		document.forms['productoptions'].elements['AddOn5'].disabled = true;
		document.forms['productoptions'].elements['AddOn2'].disabled = true;
		document.forms['productoptions'].elements['Color'].disabled = true;
		document.getElementById(elemopt).style.display = "block";
	}
	else {
		document.forms['productoptions'].elements['AddOn7'].disabled = true;
		document.getElementById(elemopt).style.display = "none";
	}
}
else if(element.getAttribute("id") == "newsbox"){
	if(element.checked == true){
		document.forms['productoptions'].elements['Color'].disabled = false;
		document.forms['productoptions'].elements['AddOn7'].disabled = true;
		document.forms['productoptions'].elements['AddOn4'].disabled = true;
		document.forms['productoptions'].elements['AddOn5'].disabled = true;
		document.forms['productoptions'].elements['AddOn2'].disabled = true;
		document.getElementById(elemopt).style.display = "block";
	}
	else {
		document.forms['productoptions'].elements['Color'].disabled = true;
		document.getElementById(elemopt).style.display = "none";
	}
}
else if(element.getAttribute("id") == "topper"){
	if(element.checked == true){
		document.forms['productoptions'].elements['AddOn2'].disabled = false;
		document.forms['productoptions'].elements['Color'].disabled = true;
		document.forms['productoptions'].elements['AddOn7'].disabled = true;
		document.forms['productoptions'].elements['AddOn4'].disabled = true;
		document.forms['productoptions'].elements['AddOn5'].disabled = true;
		document.getElementById(elemopt).style.display = "block";
	}
	else {
		document.forms['productoptions'].elements['AddOn2'].disabled = true;
		document.getElementById(elemopt).style.display = "none";
	}
}
}//end setper function