Jehl's jQuery px-to-em Conversion, Lyza's Version

pxToEm.js

$.fn.toEm = function(settings){
  settings = jQuery.extend({
    scope: 'body',
    asNumber: false
  }, settings);
  var that = parseInt(this[0],10),
    inEms,
    scopeTest = jQuery('<div style="display: none; font-size: 1em; margin: 0; padding:0; height: auto; line-height: 1; border:0;">&nbsp;</div>').appendTo(settings.scope),
    scopeVal = scopeTest.height();
  scopeTest.remove();
  inEms = (that / scopeVal).toFixed(8);
  return (settings.asNumber) ? inEms : inEms + 'em';
};

$.fn.toPx = function(settings){
  settings = jQuery.extend({
    scope: 'body',
    asNumber: false
  }, settings);
  var that = parseFloat(this[0]),
    inPx,
    scopeTest = jQuery('<div style="display: none; font-size: 1em; margin: 0; padding:0; height: auto; line-height: 1; border:0;">&nbsp;</div>').appendTo(settings.scope),
    scopeVal = scopeTest.height();
  scopeTest.remove();
  inPx = Math.round(that * scopeVal)
  return (settings.asNumber) ? inPx : inPx + 'px';
};