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var pre_elements = document.getElementsByTagName( 'pre' );

for (var i = 0; i < pre_elements.length; i++)
{
  var content = pre_elements[i].innerHTML;
  var tabs_to_remove = '';

  while (content.indexOf( '\t') == '0' )
    {
      tabs_to_remove += '\t';
      content = content.substring(1);
		}

  var re = new RegExp('\n' + tabs_to_remove, 'g');
		content = content.replace(re, '\n');
		pre_elements[i].outerHTML = '<pre>' + content + '</pre>';
}