var tick = 0;
var fgpos = 0;
var scrollback = false;
var p = false;
var intervalID = null;

function go() {
	intervalID = window.setInterval('dotick()', 50);
}

function pause() {
	p = true;
}

function resume() {
	p = false;
}

function dotick() {
	tick++;
	
	if(!p) {
		fgpos++;
		document.getElementById('scroller').scrollLeft = fgpos;
	}
}

function doscroll() {
	var e2 = document.getElementById('scroller');
	e2.style.backgroundPosition = (document.getElementById('scroller').scrollLeft / -2) + 'px 0px';

	if(navigator.appVersion.indexOf("MSIE 7.")!=-1) {
		var e = document.getElementById('portfolio-intro');
		e.className = e.className;
	}
	
	if(fgpos == document.getElementById('scroller').scrollLeft) {
		return false;
	} else {
		window.clearInterval(intervalID);
		document.getElementById('mobile-hint').style.visibility = 'hidden';	
		document.getElementById('mobile-hint').style.display = 'none';	
	}
}

window.onblur = pause;
window.onfocus = resume;