/****** MENU FUNCTIONS ******/

function show(element){
		document.getElementById(element).style.visibility = 'visible';
}
	
function hide(element){
		document.getElementById(element).style.visibility = 'hidden';
}

function changeClass(element, newClass){
		document.getElementById(element).className= newClass;
}

function errorCheck() {	
	if (document.design_email.name.value==""){
		alert("Please fill in the 'your name' field");
		return false;
	}
	if (document.design_email.visitormail.value==""){
		alert("Please fill in the 'your email' field");
		return false;
	}	
	if (document.design_email.address1.value==""){
		alert("Please fill in the 'address' field");
		return false;
	}
	if (document.design_email.postcode.value==""){
		alert("Please fill in the 'postcode' field");
		return false;
	}
	if (document.design_email.telephone.value==""){
		alert("Please fill in the 'telephone no.' field");
		return false;
	}
	if (document.design_email.comment.value==""){
		alert("Please type a message");
		return false;
	}	
		
	else {		
		return true;
	}
}