function loginClicked(div_id)
   {
	if(document.getElementById(div_id).style.display == 'none')
	{
		// visible
		document.getElementById(div_id).style.display = 'block';
		// set the class of the login button
	   document.getElementById('loginLink').className = "loginShow";
	}
	else if(document.getElementById(div_id).style.display == 'block')
	{
		// hidden
		document.getElementById(div_id).style.display = 'none';		
		// set the class of the login button
	   document.getElementById('loginLink').className = "loginHide";
	}
   }