function change_class(change_my_class, change_to_me)
{
	document.getElementById(change_my_class).className = change_to_me;
}

function toggle_visibility(element_name, forced)
{		
	if((document.getElementById(element_name).style.display == 'hidden' && forced != 'hidden') || 
		forced == 'visible' ||
		document.getElementById(element_name).style.display == '' && forced != 'hidden')
	{
		new_display = 'visible';	
	}
	else
	{
		new_display = 'hidden';	
	}	
	
	document.getElementById(element_name).style.visibility = new_display;	
}

function popup(id, url, toolbar, scrollbars, location, statusbar, menubar, resizable, width, height)
{
	window.open(url, id, 'toolbar=' + toolbar + ',scrollbars=' + scrollbars + ',location=' + location + ',statusbar=' + statusbar + ',menubar=' + menubar + ',resizable=' + resizable + ',width=' + width + ',height=' + height + '');
	return false;
}