var boDate = 'February 20th, 2012';

if (true)
{
   var bo = document.getElementById('backorder');
   bo.innerHTML = '<div style="text-indent:-3.9em; padding-left:3.9em; margin-top: 10px; color:#FF9A00;"><b>NOTE:</b> All sizes are on backorder through<br/>' + boDate + '</div>';
}