/*************************************************************************
 This code is from Dynamic Web Coding at www.dyn-web.com
 Copyright 2001-4 by Sharon Paine 
 See Terms of Use at www.dyn-web.com/bus/terms.html
 regarding conditions under which you may use this code.
 This notice must be retained in the code as is!
*************************************************************************/

/* 
  dw_scrollObj.js version date: June 2004 
  contains constructor and basic methods for scrolling layers.
  Use with dw_hoverscroll.js and/or dw_glidescroll.js,
  and for scrollbars: dw_scroll-aux.js and dw_slidebar.js
*/

dw_scrollObjs = {};
dw_scrollObj.speed = 100; // default speed for mouseover scrolling
// constructor arguments: id of layer containing scrolling layers (clipped layer), id of layer to scroll, 
//	id of table or other element that scrolling content is nested in. 
//	ns6+/moz need that extra container to get width for horizontal scrolling.
//	(not needed for vertical scrolling)
function dw_scrollObj(wnId, lyrId, cntId) {
 this.id = wnId; dw_scrollObjs[this.id] = this;
 this.animString = "dw_scrollObjs." + this.id;
 this.load(lyrId, cntId);
}

dw_scrollObj.loadLayer = function(wnId, id, cntId) {
 if ( dw_scrollObjs[wnId] ) dw_scrollObjs[wnId].load(id, cntId);
}

dw_scrollObj.prototype.load = function(lyrId, cntId) {
 if (!document.getElementById) return;
 var wndo, lyr;
 if (this.lyrId) {
  lyr = document.getElementById(this.lyrId);
  lyr.style.visibility = "hidden";
 }
 lyr = document.getElementById(lyrId);
 wndo = document.getElementById(this.id);
 lyr.style.top = this.y = 0; lyr.style.left = this.x = 0;
 this.maxY = (lyr.offsetHeight - wndo.offsetHeight > 0)? lyr.offsetHeight - wndo.offsetHeight: 0;
 this.wd = cntId? document.getElementById(cntId).offsetWidth: lyr.offsetWidth;
 this.maxX = (this.wd - wndo.offsetWidth > 0)? this.wd - wndo.offsetWidth: 0;
 this.lyrId = lyrId; // hold id of currently visible layer
 lyr.style.visibility = "visible";
 this.on_load(); this.ready = true;
}

dw_scrollObj.prototype.on_load = function() {} 

dw_scrollObj.prototype.shiftTo = function(lyr, x, y) {
 lyr.style.left = (this.x = x) + "px"; 
 lyr.style.top = (this.y = y) + "px";
}

// remove layers from table for ns6+/mozilla (needed for scrolling inside tables)
dw_scrollObj.GeckoTableBugFix = function() {
 var i, wndo, holderId, holder, x, y;
	if ( navigator.userAgent.indexOf("Gecko") > -1 && navigator.userAgent.indexOf("Firefox") == -1 ) {
  dw_scrollObj.hold = []; // holds id's of wndo and its container
  for (i=0; arguments[i]; i++) {
   if ( dw_scrollObjs[ arguments[i] ] ) {
    wndo = document.getElementById( arguments[i] );
    holderId = wndo.parentNode.id;
    holder = document.getElementById(holderId);
    document.body.appendChild( holder.removeChild(wndo) );
    wndo.style.zIndex = 1000;
    x = holder.offsetLeft; y = holder.offsetTop;
    wndo.style.left = x + "px"; wndo.style.top = y + "px";
    dw_scrollObj.hold[i] = [ arguments[i], holderId ];
   }
  }
  window.addEventListener("resize", dw_scrollObj.rePositionGecko, true);
 }
}

// ns6+/mozilla need to reposition layers onresize when scrolling inside tables.
dw_scrollObj.rePositionGecko = function() {
 var i, wndo, holder, x, y;
 if (dw_scrollObj.hold) {
  for (i=0; dw_scrollObj.hold[i]; i++) {
   wndo = document.getElementById( dw_scrollObj.hold[i][0] );
   holder = document.getElementById( dw_scrollObj.hold[i][1] );
   x = holder.offsetLeft; y = holder.offsetTop;
   wndo.style.left = x + "px"; wndo.style.top = y + "px";
  }
 }
}