function show_box(){
	if (!document.getElementById) return false;
	if (!document.getElementById("sale_property")) return false;
	var section_id = document.getElementById("sale_property");
	if(document.forms.mailingListForm.enq_type_1.checked == true){
		section_id.className = "visible";
		document.forms.mailingListForm.Valuation.value = "yes";
	}else{
		section_id.className = "hidden";
		document.forms.mailingListForm.Valuation.value = "";
	}
}