function toggle_element(elementId)
{    	
	var obj = document.getElementById(elementId);
	var val;
		
	if(navigator.appName == "Microsoft Internet Explorer")
		val = 'inline';
	else
		val = 'table-cell';
			
	if (obj.style.display == val)
	{
		obj.style.display = 'none';
		obj.style.visibility = 'hidden';
	}
	else
	{
		obj.style.display = val;
   		obj.style.visibility = 'visible';
	}	
}

function showWindow()
{	
	window.open('login.window.php','Login','width=300,height=200')
}