var Poll = function(arr) {
    for(var i = 0; i < arr.length; i++) {
        var el = document.getElementById(arr[i][0]);
	    var elWidth = el.offsetWidth;
        var graphWidth = (elWidth / 100) * arr[i][1];
        var bgLeftPos = parseInt(graphWidth - elWidth);
        el.style.backgroundPosition = bgLeftPos + "px top";
    }
}