// Start speed layers code
function switchDiv_tab(div_id)
{
  var style_sheet = getStyleObject(div_id);
  if (style_sheet)
  {
    hideAll_tab();
    changeObjectDisplay(div_id,"block");
  }

}

// function hideAll()
//  hides a bunch of divs
//
function hideAll_tab()
{
   changeObjectDisplay("product_benefits","none");
   changeObjectDisplay("product_specification","none");
   changeObjectDisplay("product_usage","none");
   changeObjectDisplay("plustalk","none");   
}
// End speed layers code

switchDiv_tab('product_benefits');