// Copyright 2006 by XIDEMIA http://www.xidemia.com/

function photog(nr)
{
	if (nr-1>0)
	{
		document.getElementById('llink').innerHTML='<a href="javascript:photog('+(nr-1)+');" style="font-size:20px;">&laquo;</a>';		
	}
	else
	{
		document.getElementById('llink').innerHTML='&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';		
	}
	if (nr!=photolast)
	{
		document.getElementById('rlink').innerHTML='<a href="javascript:photog('+(nr+1)+');" style="font-size:20px;">&raquo;</a>';		
	}
	else
	{
		document.getElementById('rlink').innerHTML='&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';		
	}

	document.getElementById('gfoto').src='./gallery/'+photsrc[nr];
	document.getElementById('glink').href=photsrcoryg[nr];
	document.getElementById('gfotodesc').innerHTML=photinfo[nr];
}


var getFFVersion=navigator.userAgent.substring(navigator.userAgent.indexOf("Firefox")).split("/")[1]
var FFextraHeight=parseFloat(getFFVersion)>=0.1? 25 : 0 //extra height in px to add to iframe in FireFox 1.0+ browsers 
var IEextraHeight=0;
if (navigator.appName=='Microsoft Internet Explorer')
{
	IEextraHeight=-20;
}
//We wrap all the code in an object so that it doesn't interfere with any other code
var scroller = {
  init:   function() {

    //collect the variables
	if (document.getElementById("content")==null)
	{
		return;
	}
    scroller.docH = document.getElementById("content").offsetHeight+FFextraHeight;
    scroller.contH = document.getElementById("container3").offsetHeight-IEextraHeight;
    scroller.scrollAreaH = document.getElementById("scrollArea").offsetHeight;

	if (scroller.docH<=scroller.contH)
	{
		document.getElementById("scroller_container").style.display = "none";
		document.getElementById("scroller").style.height = scroller.scrollAreaH + "px";
	}
	else
	{
		//calculate height of scroller and resize the scroller div
		//(however, we make sure that it isn't to small for long pages)
		scroller.scrollH = (scroller.contH * scroller.scrollAreaH) / scroller.docH;
		//if(scroller.scrollH < 15) scroller.scrollH = 15;
		document.getElementById("scroller").style.height = Math.round(scroller.scrollH) + "px";
		
		//what is the effective scroll distance once the scoller's height has been taken into account
		scroller.scrollDist = Math.round(scroller.scrollAreaH-scroller.scrollH);
		
		//make the scroller div draggable
		Drag.init(document.getElementById("scroller"),null,0,0,-1,scroller.scrollDist);
		
		//add ondrag function
		document.getElementById("scroller").onDrag = function (x,y) {
		  var scrollY = parseInt(document.getElementById("scroller").style.top);
		  var docY = 0 - (scrollY * (scroller.docH - scroller.contH) / scroller.scrollDist);
		  document.getElementById("content").style.top = docY + "px";
		}
	}
  }
}

var gIncrement = 15;
var gTimerId = null;
var sdirection = 0;

onload = scroller.init;

function cscroll()
{
      var scrollY = parseInt(document.getElementById("scroller").style.top);
	  scrollY=scrollY+1*sdirection;
	  if (scrollY<0)
	  {
		  scrollY=0;
	  }
	  
	  if (scrollY>scroller.scrollAreaH-scroller.scrollH)
	  {
		  scrollY=scroller.scrollAreaH-scroller.scrollH;
	  }
	  document.getElementById("scroller").style.top= scrollY + "px";
      var docY = 0 - (scrollY * (scroller.docH - scroller.contH) / scroller.scrollDist);
      document.getElementById("content").style.top = docY + "px";

}

function contentscroll(direction)
{
	  if (scroller.docH<=scroller.contH) return;
	  sdirection=direction;
	  gTimerId = window.setInterval(cscroll,50);
}

function manual_scroll(pos)
{
	sdirection=pos;
	cscroll();
}

function timerStop()
{
	window.clearInterval(gTimerId);
}