var timerlen = 3;
var slideAniLen = 500;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var endTop = new Array();
var moving = new Array();
var dir = new Array();
var media = new Array();

var divdown = false;
var downdiv = '';

function menuchoice(objname, background, mediaload){
	//alert('gal removing');
	removeGallery();
	removeVideos();
	//alert('gal removed');
	if(moving[objname])
		return;
	if(moving[background])
		return;
	if(divdown) {
		if(moving[downdiv])
			return;
			
		document.getElementById(downdiv).style.display = "none";
		document.getElementById(background).style.display = "none";
	}
	
	slidedown(background,"");
	slidedown(objname,mediaload);
	
	divdown = true;
	downdiv = objname;
}

function slidealldown(){
	removeGallery();
	removeVideos();
	slideup('Back');
	slideup('Slide1');
	slideup('Slide2');
	slideup('Slide3');
	slideup('Slide4');
	slideup('Slide5');
	slideup('Slide6');
	slideup('Slide7');
	slideup('Slide8');
}

function slidedown(objname,medianame){
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display != "none")
                return; // cannot slide down something that is already visible

        moving[objname] = true;
        dir[objname] = "down";
		media[objname] = medianame;
        startslide(objname);
}

function slideup(objname){
        if(moving[objname])
                return;

        if(document.getElementById(objname).style.display == "none")
                return; // cannot slide up something that is already hidden

        moving[objname] = true;
        dir[objname] = "up";
        startslide(objname);
}

function startslide(objname){
        obj[objname] = document.getElementById(objname);

        endHeight[objname] = parseInt(obj[objname].style.height);
		endTop[objname] = parseInt(obj[objname].style.top);
        startTime[objname] = (new Date()).getTime();

        if(dir[objname] == "down"){
				obj[objname].style.top = (endHeight[objname] - 1 + endTop[objname]) + "px";
                obj[objname].style.height = "1px";
        }

        obj[objname].style.display = "block";

        timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}

function slidetick(objname){
        var elapsed = (new Date()).getTime() - startTime[objname];

        if (elapsed > slideAniLen)
                endSlide(objname)
        else {
                var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
                if(dir[objname] == "up")
                	d = endHeight[objname] - d;
                obj[objname].style.height = d + "px";
				obj[objname].style.top = endHeight[objname] - d + endTop[objname] + "px";
        }

        return;
}

function endSlide(objname){
		if(moving[objname]){
        	clearInterval(timerID[objname]);

        	if(dir[objname] == "up")
                obj[objname].style.display = "none";

        	obj[objname].style.height = endHeight[objname] + "px";
			obj[objname].style.top = endTop[objname] + "px";

			if(media[objname] =="photos" ) 
				createGallery();
			
			if(media[objname] =="videos" )
				createVideos();

        	delete(moving[objname]);
        	delete(timerID[objname]);
        	delete(startTime[objname]);
        	delete(endHeight[objname]);
        	delete(obj[objname]);
        	delete(dir[objname]);
			delete(media[objname]);
			delete(endTop[objname]);
		}
        return;
}