// Changes style for top navigation
function sideNav(objSideNavLink){
	list = document.getElementById("nav");
	ResetNodes(list);

	objSideNavLink.className = "currentpage";
}
function ResetNodes(node)
{
	for (var i = 0; i < node.childNodes.length; i++)
	{
		var className = node.childNodes[i].className;
		if (node.childNodes[i].className == "currentpage")
			node.childNodes[i].className = "default";
		else {
			var node1 = node.childNodes[i];
			if (node1.childNodes.length > 0)
				ResetNodes(node1);
		}
    }
}

/*
Validation for the Required Fields on the Sign Up Form
*/
 
 function isEmpty(s) {
     return ((s == null) || (s.length == 0))
 }
 
 function validate()
{

	var alert_message = "The following fields have not been filled out: \n";
	var alert_message_orig = "The following fields have not been filled out: \n";

	// Add variable declarations for form elements here
	var realname = document.signupform.realname.value;
	var telephone = document.signupform.telephone.value;
	var email = document.signupform.email.value;
	
	// Add more 'if' statements here for each variable created

	if (isEmpty(realname))

		alert_message += "Name\n";
		
	if (isEmpty(telephone))

		alert_message += "Telephone\n";
		
	if (isEmpty(email))

		alert_message += "E-mail\n";
		
	if (alert_message_orig != alert_message)
	{
		alert(alert_message);
		return false;
	}
	else
		return true;	


}