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function isBreakPoint(bp) {
  // The breakpoints that you set in your css
  var bps = [320, 480, 768, 1024];
  var w = $(window).width();
  var min, max;
  for (var i = 0, l = bps.length; i < l; i++) {
    if (bps[i] === bp) {
      min = bps[i-1] || 0;
      max = bps[i];
      break;
    }
  }
  return w > min && w <= max;
}


if ( isBreakPoint(320) ) { 
  // breakpoint at 320 or less
}
if ( isBreakPoint(480) ) { 
  // breakpoint between 320 and 480
}