function hidePopin(which){
    if($('popIn' + which)){
        $('popIn' + which).hide();
    }
    return false;
}
function showPopin(which){
	move_img(which);
    if($('popIn' + which)){
        $('popIn' + which).show();
    }
    return false;
}
function move_img(which){
		var coords = $('container').cumulativeScrollOffset();
		var newtop = coords.top + 140 + 'px';
		//var newwidth = ((document.viewport.getWidth()/2) - 789 ) + 'px';
		$('popIn'+which).setStyle({ top:newtop });
}