/*	-------------------------------------------------------------
	Environmental Center for Arab Towns Website
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	Description:	Scroller Scripts / Functions
	Filename:		scroller.js
	Version:		1.0
	Date:			March 04, 2005
	-------------------------------------------------------------	*/

    var restarea = 6;
    var maxspeed = 2;
    var endofgallerymsg = "";

    var iedom = document.all || document.getElementById;
    var scrollspeed = 1;
    var movestate = "";

    var actualwidth = '';
    var cross_scroll, ns_scroll;
    var loadedyes = 0;

    function ietruebody()
    {
        return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body;
    }

    function creatediv()
    {
        statusdiv = document.createElement("div");
        statusdiv.setAttribute("id","statusdiv");
        document.body.appendChild(statusdiv);
        statusdiv = document.getElementById("statusdiv");
        statusdiv.innerHTML = endofgallerymsg;
    }

    function positiondiv()
    {
        menuheight = parseInt(crossmain.offsetHeight);
        mainobjoffsetH = getposOffset(crossmain, "top");
        statusdiv.style.left = mainobjoffset+(menuwidth/2)-(statusdiv.offsetWidth/2) + "px";
        statusdiv.style.top = menuheight+mainobjoffsetH + "px";
    }

    function showhidediv(what)
    {
        if (endofgallerymsg!="")
        statusdiv.style.visibility = what;
    }

    function getposOffset(what, offsettype)
    {
        var totaloffset=(offsettype=="left")? what.offsetLeft: what.offsetTop;
        var parentEl=what.offsetParent;
        while (parentEl!=null)
        {
            totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
            parentEl=parentEl.offsetParent;
        }
        return totaloffset;
    }

    function moveleft()
    {
        if (loadedyes)
        {
            movestate = "left";
            if (iedom&&parseInt(cross_scroll.style.left)>(menuwidth-actualwidth))
            {
                cross_scroll.style.left=parseInt(cross_scroll.style.left)-scrollspeed + "px";
                showhidediv("hidden");
            }
            else showhidediv("visible");
        }
        lefttime=setTimeout("moveleft()",10)
    }

    function moveright()
    {
        if (loadedyes)
        {
            movestate = "right";
            if (iedom&&parseInt(cross_scroll.style.left)<0)
            {
                cross_scroll.style.left=parseInt(cross_scroll.style.left)+scrollspeed + "px";
                showhidediv("hidden");
            }
            else showhidediv("visible");
        }
        righttime = setTimeout("moveright()",10);
    }

    function motionengine(e)
    {
   
        var dsocx=(window.pageXOffset)? pageXOffset: ietruebody().scrollLeft;
        var dsocy=(window.pageYOffset)? pageYOffset : ietruebody().scrollTop;
        var curposy=window.event? event.clientX : e.clientX? e.clientX: "";
        curposy-=mainobjoffset - dsocx;
        var leftbound=(menuwidth-restarea)/2;
        var rightbound=(menuwidth+restarea)/2;
        if (curposy>rightbound)
        {
            scrollspeed=(curposy-rightbound)/((menuwidth-restarea)/2) * maxspeed;
            if (window.righttime) clearTimeout(righttime);
            if (movestate!="left") moveleft();
        }
        else if (curposy<leftbound)
        {
            scrollspeed=(leftbound-curposy)/((menuwidth-restarea)/2) * maxspeed;
            if (window.lefttime) clearTimeout(lefttime);
            if (movestate!="right") moveright();
        }
        else scrollspeed = 0;
    }

    function contains_ns6(a, b)
    {
        while (b.parentNode)
        if ((b = b.parentNode) == a)return true;
        return false;
    }

    function stopmotion(e)
    {
        if ((window.event&&!crossmain.contains(event.toElement)) || (e && e.currentTarget && e.currentTarget!= e.relatedTarget && !contains_ns6(e.currentTarget, e.relatedTarget)))
        {
            if (window.lefttime) clearTimeout(lefttime);
            if (window.righttime) clearTimeout(righttime);
            movestate="";
        }
    }

    function fillup()
    {
        if (iedom)
        {
            crossmain=document.getElementById? document.getElementById("motioncontainer") : document.all.motioncontainer;
            menuwidth=parseInt(crossmain.style.width);
            mainobjoffset=getposOffset(crossmain, "left");
            cross_scroll=document.getElementById? document.getElementById("motiongallery") : document.all.motiongallery;
            actualwidth=document.all? cross_scroll.offsetWidth : document.getElementById("trueContainer").offsetWidth;

            crossmain.onmousemove=function(e)
            {
                motionengine(e);
            }

            crossmain.onmouseout=function(e)
            {
                stopmotion(e);
                showhidediv("hidden");
            }
        }
        loadedyes = 1;
        if (endofgallerymsg!="")
        {
            creatediv();
            positiondiv();
        }
    }
    
    window.onload = fillup;

    function Left(e)
    {
	    loadedyes=1;
	    motionengine(e);
    }

    function Right(e)
    {
	    loadedyes=1;
	    motionengine(e);
    }