var timerlen = 50;
var slideAniLen = 500;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();
var pobjname,ppicid,pimg_on,pimg_off; 
function toggleslide(objname,picid,img_on,img_off){// id tou div me to periexomeno, id ths eikonas gia klik, eikona otan einai klikarismeno, eikona otan den einai klikarismeno
	
	if(pobjname){
	 //document.getElementById(ppicid).src="images/" + pimg_off;
	 slideup(pobjname,ppicid,pimg_off);
	}
	 pobjname = objname
	 ppicid = picid
	 pimg_off = img_off

	//document.getElementById(picid).src="images/" + img_on;	 
	slidedown(objname,ppicid,img_on);	
		
}


function slidedown(objname,picid,pic_down){
        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";
        startslide(objname);
		document.getElementById(picid).src="images/" + pic_down;
}

function slideup(objname,picid,pic_up){
        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);
		document.getElementById(picid).src="images/" + pic_up;	 
		
}

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

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

        if(dir[objname] == "down"){
                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";
        }

        return;
}

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

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

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

        delete(moving[objname]);
        delete(timerID[objname]);
        delete(startTime[objname]);
        delete(endHeight[objname]);
        delete(obj[objname]);
        delete(dir[objname]);

        return;
}