var isExtended = 0;
var height = 450;
var width = 300;
var slideDuration = 1000;
var opacityDuration = 1500;


function extendContract(){
    
    if(isExtended == 0){
        sideBarSlide(0, height, 1, width);
        
        sideBarOpacity(0, 1);
    
        isExtended = 1;
        
    
        // make expand tab arrow image face left (inwards)
        $('sideBarTab').childNodes[0].src = $('sideBarTab').childNodes[0].src.replace(/(\.[^.]+)$/, '-active$1');
        
    }
    else{
        
        sideBarSlide(height, 0, width, 1);
        
        sideBarOpacity(1, 0);
        
        isExtended = 0;
        
        // make expand tab arrow image face right (outwards)
        
        $('sideBarTab').childNodes[0].src = $('sideBarTab').childNodes[0].src.replace(/-active(\.[^.]+)$/, '$1');

    }

}

function sideBarSlide(fromHeight, toHeight, fromWidth, toWidth){
        var myEffects = new Fx.Styles('sideBarContents', {duration: slideDuration, transition: Fx.Transitions.linear});
        myEffects.custom({
             'height': [fromHeight, toHeight],
             'width': [fromWidth, toWidth]
        });
}

function sideBarOpacity(from, to){
        var myEffects = new Fx.Styles('sideBarContents', {duration: opacityDuration, transition: Fx.Transitions.linear});
        myEffects.custom({
             'opacity': [from, to]
        });
}



function init(){
    var myEffects = new Fx.Styles('sideBarContents', {duration: 1, transition: Fx.Transitions.linear});
        myEffects.custom({
             'height': [450, 450],
             'width': [2, 1]
        });
    $('sideBarTab').addEvent('click', function(e){extendContract(); sideBarOpacity(0, 1); });
}

window.addEvent('load', function(){init()});