$(function()
  {
  var div = $('div.sc_clients'),
  	  ul = $('ul.sc_clients'),
	  ulPadding = 15;
  var divWidth = div.width();

  div.css({overflow: 'hidden'});

  var lastLi = ul.find('li:last-child');

  div.mousemove(function(e)
    {
	var ulWidth = lastLi[0].offsetLeft + lastLi.outerWidth() + ulPadding;
	var left = (e.pageX - div.offset().left) * (ulWidth-divWidth) / divWidth;
	div.scrollLeft(left);
	});
});