var x = document.getElementById("carttotal").innerHTML.replace(",", "");
var y = 450-x;
var z = Math.round(y*100)/100;

if (y <= 450, y > 0)
  {
    document.write("<div id='redship'>$" + z.toFixed(2) + "</div><div style='color: #3d1a06; display: inline; font-weight: bold;'> needed for FREE SHIPPING*</div>");
  }
else if (y <= 0)
  {
    document.write("<div style='color: #186a0a; margin: 2px 0px 0px 12px; font-size: 1.15em; float: left; font-weight: bold;'>You may qualify for FREE SHIPPING!</div>");
  }