// dhtml scroll functions

// Browsercheck:
function lib_bwcheck()
{ 
  this.ver	= navigator.appVersion;
  this.agent	= navigator.userAgent;
  this.dom	= document.getElementById?1:0;
  this.opera5	= (navigator.userAgent.indexOf("Opera")>-1 && document.getElementById)?1:0;
  this.ie5	= (this.ver.indexOf("MSIE 5")>-1 && this.dom && !this.opera5)?1:0; 
  this.ie6	= (this.ver.indexOf("MSIE 6")>-1 && this.dom && !this.opera5)?1:0;
  this.ie4	= (document.all && !this.dom && !this.opera5)?1:0;
  this.ie	= this.ie4||this.ie5||this.ie6;
  this.mac	= this.agent.indexOf("Mac")>-1;
  this.ns6	= (this.dom && parseInt(this.ver) >= 5) ?1:0; 
  this.ns4	= (document.layers && !this.dom)?1:0;
  this.bw	= (this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera5);
  return this;
}

var bw = new lib_bwcheck();
var speed = 50;
var loop, timer;

// Object constructor
function makeObj(obj,nest)
{
  nest=(!nest) ? "":'document.'+nest+'.';
  this.el=bw.dom?document.getElementById(obj):bw.ie4?document.all[obj]:bw.ns4?eval(nest+'document.'+obj):0;
  this.css=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval(nest+'document.'+obj):0;
  this.scrollHeight=bw.ns4?this.css.document.height:this.el.offsetHeight;
  this.clipHeight=bw.ns4?this.css.clip.height:this.el.offsetHeight;
  this.up=goUp;this.down=goDown;
  this.moveIt=moveIt; this.x=0; this.y=0;
  this.obj = obj + "Object";
  eval(this.obj + "=this");
  return this;
}

// A unit of measure that will be added when setting the position of a layer.
var px = bw.ns4||window.opera?"":"px";

// gets the vertical position from the scrollable area
function getDivPosition()
{
  return oScroll.y;
}

//sets the vertical position for the scrollable area 
//this function is used after reload of i.e. productlist
function repositionDiv(y)
{
  oScroll.moveIt(0,y);
  return;
}

function moveIt(x,y)
{
  this.x = x;
  this.y = y;
  this.css.left = this.x+px;
  this.css.top = this.y+px;
}

// Makes the object go up
function goDown(move)
{
  if (this.y>-this.scrollHeight+oCont.clipHeight)
  {
    this.moveIt(0,this.y-move);
    if (loop) setTimeout(this.obj+".down("+move+")",speed);
  }
}

// Makes the object go down
function goUp(move)
{
  if (this.y<0)
  {
    this.moveIt(0,this.y-move);
    if (loop) setTimeout(this.obj+".up("+move+")",speed);
  }
}

// Calls the scrolling functions. Also checks whether the page is loaded or not.
function scroll(speed)
{
  if (scrolltextLoaded)
  {
    loop = true;
    if (speed>0) oScroll.down(speed);
    else oScroll.up(speed);
  }
}

// Stops the scrolling (called on mouseout)
function noScroll()
{
  loop = false;
  if (timer) clearTimeout(timer);
}

// checks the height of the scrollable area and disables the buttons, if they are not necessery
function checkHeightForButtons()
{
  
  if (oScroll.clipHeight > oCont.clipHeight)
  {
    // alert("Scrollbuttons an!");
    oButtUp.css.visibility = "visible";
  }
}

// Makes the object
var scrolltextLoaded = false;
function scrolltextInit()
{
  oCont = new makeObj('divScrollTextCont');
  oScroll = new makeObj('divText','divScrollTextCont');
  oButtUp = new makeObj('divControlUp');
  oScroll.moveIt(0,0);
  checkHeightForButtons();
  oCont.css.visibility = "visible";
  scrolltextLoaded = true;
  
}