// Swap image source
	function swap(name,img)
	{
		document.images[name].src = img;
	}

	// open 2 pages each in a different frame
	function openurl(url1, url2)
	{
		parent.frames["menu"].location=url1;
		parent.frames["body"].location=url2;
	}

	// check and post contact form
	function submitEmailForm()
	{
		var msg 			= "The following fields are required:\n";
		var submit_ok		= true;

		// required fields
		if(document.emailForm.name.value == "") {
			msg = msg + "\n Name";
			submit_ok=false ;
		}

		if(document.emailForm.address.value == "") {
			msg = msg + "\n Address";
			submit_ok=false ;
		}

		if(document.emailForm.zip.value == "") {
			msg = msg + "\n Postal code";
			submit_ok=false ;
		}

		if(document.emailForm.city.value == "") {
			msg = msg + "\n City";
			submit_ok=false ;
		}

		if(document.emailForm.email.value == "") {
			msg = msg + "\n E-mail address";
			submit_ok=false ;
		}

		if(document.emailForm.message.value == "") {
			msg = msg + "\n Message";
			submit_ok=false ;
		}

		// if complete submit, else alert
		if(submit_ok == true) {
			document.email.submit();
		} else {
			alert(msg);
		}

		return submit_ok;
	}