var x = 0;
var y = 0;

function mouseover(bla)
{
        //var objX = findx(bla);
	//var objY = findy(bla);

	x = e.pageX;
	y = e.pageY;
	
	//x -= objX;
	//y -= objY;

	document.getElementById('thumb1').style.backgroundPosition = ''+(-165 + x)+'px ' + (-170 + y)+'px';
}