/***********************************************
* Dock Content script- Created by and © Dynamicdrive.com
* This notice must stay intact for use
* Visit http://www.dynamicdrive.com/ for full script
***********************************************/

var offsetfromedge=0      //offset from window edge when content is "docked". Change if desired.
var dockarray=new Array() //array to cache dockit instances
var dkclear=new Array()   //array to cache corresponding clearinterval pointers

function dockit(el, duration){
	this.source=document.all? document.all[el] : document.getElementById(el);
	this.source.height=this.source.offsetHeight;
	this.docheight=truebody().clientHeight;
	this.duration=duration;
	this.pagetop=0;
	this.elementoffset=this.getOffsetY();
	dockarray[dockarray.length]=this;
	var pointer=eval(dockarray.length-1);
	var dynexpress='dkclear['+pointer+']=setInterval("dockornot(dockarray['+pointer+'])",100);';
	dynexpress=(this.duration>0)? dynexpress+'setTimeout("clearInterval(dkclear['+pointer+']); dockarray['+pointer+'].source.style.top=0", duration*1000)' : dynexpress;
	eval(dynexpress);
}

dockit.prototype.getOffsetY=function(){
	var totaloffset=parseInt(this.source.offsetTop);
	var parentEl=this.source.offsetParent;
	while (parentEl!=null){
		totaloffset+=parentEl.offsetTop;
		parentEl=parentEl.offsetParent;
	}
	return totaloffset;
}

function dockornot(obj) {
	if(navigator.appName == "Netscape") {
		obj.pagetop=(truebody().scrollTop);
	} else if (navigator.appName == "Microsoft Internet Explorer") {
		obj.pagetop=(truebody().scrollTop)-290;
	}
	if (obj.pagetop>obj.elementoffset){ //detect upper offset
		obj.source.style.top=obj.pagetop-obj.elementoffset+offsetfromedge+"px";
	}else if (obj.pagetop+obj.docheight<obj.elementoffset+parseInt(obj.source.height)){ //lower offset
		obj.source.style.top=obj.pagetop+obj.docheight-obj.source.height-obj.elementoffset-offsetfromedge+"px";
	}else{
		obj.source.style.top=0;
	}
}

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