function displayHowDid(doc, sender){
		var referral_customer 		= doc.getElementById("referral_customer");
		var referral_technician		= doc.getElementById("referral_technician");
		var specific_exhibition		= doc.getElementById("specific_exhibition");
		var specific_advert			= doc.getElementById("specific_advert");
		var specific_searchengine	= doc.getElementById("specific_searchengine");
		var otherhearfrom 	= doc.getElementById("otherhearfrom");
		if(sender.value == "Referred By"){
			referral_customer.style.visibility = "visible";
			specific_advert.style.visibility = "hidden";
			specific_exhibition.style.visibility = "hidden";
			specific_searchengine.style.visibility = "hidden";
			<!-- referral_technician.style.visibility = "hidden";-->
		}
		else if(sender.value == "Advert"){
			referral_customer.style.visibility = "hidden";
			specific_exhibition.style.visibility = "hidden";
			specific_searchengine.style.visibility = "hidden";
			specific_advert.style.visibility = "visible";
			<!--referral_technician.style.visibility = "visible";-->
		}
		else if(sender.value == "Exhibition"){
			referral_customer.style.visibility = "hidden";
			specific_advert.style.visibility = "hidden";
			specific_searchengine.style.visibility = "hidden";
			specific_exhibition.style.visibility = "visible";
			<!--referral_technician.style.visibility = "visible";-->
		}
		else if(sender.value == "Search Engine"){
			referral_customer.style.visibility = "hidden";
			specific_advert.style.visibility = "hidden";
			specific_exhibition.style.visibility = "hidden";
			specific_searchengine.style.visibility = "visible";
			<!--referral_technician.style.visibility = "visible";-->
		}		
		else if(sender.value == "Technician"){
			referral_customer.style.visibility = "hidden";
			specific_advert.style.visibility = "hidden";
			specific_exhibition.style.visibility = "hidden";
			specific_searchengine.style.visibility = "hidden";
			<!--referral_technician.style.visibility = "visible";-->
		}
		else{
			<!--referral_technician.style.visibility = "hidden";-->
			referral_customer.style.visibility = "hidden";
			specific_advert.style.visibility = "hidden";
			specific_exhibition.style.visibility = "hidden";
			specific_searchengine.style.visibility = "hidden";
		}
	}
			
	function displayReferralRewards(doc, sender){
		var otherreferralreward = doc.getElementById("otherreferralreward");

		if(sender.value == "Other"){
			otherreferralreward.style.visibility = "visible";
		}
		else{
			otherreferralreward.style.visibility = "hidden";
		}
	}
	
	function displayOtherStates(doc, sender){
		var otherstate = doc.getElementById("otherstate");
		var state = doc.getElementById("state");
		
		if(sender.value != "Australia"){
			otherstate.style.visibility = "visible";
			state.style.visibility = "hidden";
		}
		else{
			otherstate.style.visibility = "hidden";
			state.style.visibility = "visible";
			sender.form.elements['input[OtherState]'].value = "";
		}
	}

	function displayOtherStates_d(doc, sender){
		var otherstate = doc.getElementById("otherstate_d");
		var state = doc.getElementById("state_d");
		
		if(sender.value != "Australia"){
			otherstate_d.style.visibility = "visible";
			state_d.style.visibility = "hidden";
		}
		else{
			otherstate_d.style.visibility = "hidden";
			state_d.style.visibility = "visible";
			sender.form.elements['input[OtherState_D]'].value = "";
		}
	}
	
	function displayOtherStates_b(doc, sender){
		var otherstate = doc.getElementById("otherstate_b");
		var state = doc.getElementById("state_b");
		
		if(sender.value != "Australia"){
			otherstate_b.style.visibility = "visible";
			state_b.style.visibility = "hidden";
		}
		else{
			otherstate_b.style.visibility = "hidden";
			state_b.style.visibility = "visible";
			sender.form.elements['input[OtherState_B]'].value = "";
		}
	}