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// Scroll Slut v0.1
// by     xpsdeset
// @description   This baby Makes it easy to Scroll web.
//Being lazy I hated to Scroll A page especially it was an endless scroll to visit the bottom of page.Also i hated to use my keyboard shortcut keys.
//Why use keyboard when we can do actual surfing with total control of mouse
//You Screen is divided into 4 logical big button see http://xpsdeset.googlepages.com/scrollslut.jpg
//double click on the button and you can goto start or bottom of the page ,view a page one screen at a time with page up or down..
// Browser Window Size and Position  functions by
// copyright Stephen Chapman, 
// you may copy these functions but please keep the copyright notice as well



var win,doc;
jetpack.tabs.onFocus(function()
{
	win=this.contentWindow;
	doc=this.contentDocument;
});
jetpack.tabs.onReady(function(_doc)
{
	win=this.contentWindow;
	doc=_doc;
	doc.addEventListener('dblclick', function(event) {

	
	eX=event.pageX; 
	eY=event.pageY;
	pX=pageWidth();
	pb=posBottom();
	pt=posTop();
	ph=pageHeight();
	
	pY=posTop()+ph/2;
	
	goY=0;
	if(eX<=pX/2 && eY<=pY)  //home
	{
	goY=0;
	win.scrollTo(0,goY); 
	}
	
	if(eX<=pX/2 && eY>pY)  //end
	{
	goY=100000;
	win.scrollTo(0,goY); 
	}

	
	
	if(eX>pX/2 && eY<=pY)  //pageUp
	{
	goY=eY-(ph*0.75);
	if(goY<0)
	goY=0;
	win.scrollTo(0,goY); 
	}
	
	
	if(eX>pX/2 && eY>pY)  //pageDown
		win.scrollTo(0,eY);		
    }, true);

	
	


	
});

jetpack.statusBar.append({html: '<img src="http://xpsdeset.googlepages.com/ico.png">', width: 32});

function pageWidth() {return win.innerWidth != null? win.innerWidth : doc.documentElement && doc.documentElement.clientWidth ?       doc.documentElement.clientWidth : doc.body != null ? doc.body.clientWidth : null;} 
function pageHeight() {return  win.innerHeight != null? win.innerHeight : doc.documentElement && doc.documentElement.clientHeight ?  doc.documentElement.clientHeight : doc.body != null? doc.body.clientHeight : null;} 
function posTop() {return typeof win.pageYOffset != 'undefined' ?  win.pageYOffset : doc.documentElement && doc.documentElement.scrollTop ? doc.documentElement.scrollTop : doc.body.scrollTop ? doc.body.scrollTop : 0;} 
function posBottom() {return posTop()+pageHeight();}