function change(hmm,hmb){
	document.getElementById("hmm1").style.display="none";
	document.getElementById("hmm2").style.display="none";
	document.getElementById("hmm3").style.display="none";
	document.getElementById("hmm4").style.display="none";
	document.getElementById("hmm5").style.display="none";
	document.getElementById("hmm6").style.display="none";
	
	document.getElementById("hmb1").style.display="none";
	document.getElementById("hmb2").style.display="none";
	document.getElementById("hmb3").style.display="none";
	document.getElementById("hmb4").style.display="none";
		
	document.getElementById(hmm).style.display="block";
	document.getElementById(hmb).style.display="block";
	}
function pchange(p){
	document.getElementById("p1").style.display="none";
	document.getElementById("p2").style.display="none";
	document.getElementById("p3").style.display="none";
	document.getElementById("p4").style.display="none";
	
	document.getElementById(p).style.display="block";
}
function CheckForm() {
		if (document.orderonline.product.value == "") {
			alert("Product name is required.");
			document.orderonline.product.focus();
			return false;
		}
		else if (document.orderonline.name.value == "") {
			alert("Name is required.");
			document.orderonline.name.focus();
			return false;
		}
		else if (document.orderonline.tel.value == "") {
			alert("Telephone is required.");
			document.orderonline.tel.focus();
			return false;
		}
		else if (document.orderonline.email.value == "") {
			alert("Email is required");
			document.orderonline.email.focus();
			return false;
		}	
		else 
			document.getElementById('orderonline').submit();
	}