//
// private functions
//


var win = new Array() ;

function openPopup( name, url, size, title) 
{
	// open a new window 
	win[name] = window.open( url, name, size ) ;
	
	// give the new window focus
	if (
		( win[name] != null ) && 
		( win[name].closed == false ) 
	)
	{
		win[name].focus() ;
	}
	else 
	{ 
		return false ;
	}
}

function closePopup( window_name ) 
{
	if (
		win[window_name] != null && 
		! win[window_name].closed
	) 
	{
		win[window_name].close();
	}
	
	return ;
}

//
// public functions
//

function startHorizon( channel, useplugin, user, password, nickname, paramstring ) 
{
    var windowname = "horizonWin";
    var horizonurl = "http://ubc.wimba.com/check_wizard.pl";
    
    // set the channel ( default to lobby )
    if ( channel != null) {
        horizonurl += "?channel=" + channel;
    }
    else {
        horizonurl += "?channel=lobby";
    }
    
    if ( useplugin != null ) {
        horizonurl += "&useplugin=" + useplugin;
    }
    
    if ( user != null ) {
        horizonurl += "&AuthName=Horizon&credential_0=" + user;
    }

    if ( password != null ) {
        horizonurl += "&credential_1=" + password;
    }

    if ( nickname != null ) {
        horizonurl += "&credential_2=" + nickname;
    }
    
    if ( paramstring != null ) {
        horizonurl += "&" + paramstring;
    }
    
    // open a window with the horizon ui
    var properties = "scrollbars=no,resizable=yes,width=900,height=648" ;
    openPopup( windowname, horizonurl, properties, "Wimba Classroom");  
    
    return;
}

function startHorizonTeach( channel, useplugin, user, password, nickname, paramstring ) 
{
    // additional params for the presenter ui
    var p = "hzlgasknick=0";
    p += "&hzlgaskpass=1";
    p += "&" + paramstring;
    
    startHorizon( channel, useplugin, user, password, nickname, p );
    
    return;
}

function startWizard( config ) 
{
    var url = "http://ubc.wimba.com/wizard/wizard.html";

    if ( config == null ) {
        url += "?wc=" + "wizard.conf";
    }
    else {
        url += "?wc=" + config;
    }
    
    // open a window with the horizon ui
    var properties = "scrollbars=no,resizable=no,width=900,height=648" ;
    openPopup( "wizard", url, properties, "Wimba Classroom Wizard" );
    
    return;
}