OAS_version = 10;
function OAS_NORMAL(pos)
{
   document.write('<a href="http://oas.biomedcentral.com/RealMedia/ads/click_nx.ads/www.controlled-trials.com/1584621585@Top,Bottom,Right1,Right2!' + pos + '" target=_top>');
   document.write('<img src="http://oas.biomedcentral.com/RealMedia/ads/adstream_nx.ads/www.controlled-trials.com/1584621585@Top,Bottom,Right1,Right2!' + pos + '" border=0></a>');
}



OAS_version = 11;
if (navigator.userAgent.indexOf('Mozilla/3') > 1)
   OAS_version = 10;
if (navigator.userAgent.indexOf('Netscape/7.0') > 1)
   OAS_version = 10;
if (OAS_version >= 11)
   document.write('<script language=JavaScript1.1 src="http://oas.biomedcentral.com/RealMedia/ads/adstream_mjx.ads/www.controlled-trials.com/1584621585@Top,Bottom,Right1,Right2"></script>');


document.write('');
function OAS_AD(pos)
{
   if (OAS_version >= 11)
      OAS_RICH(pos);
   else
      OAS_NORMAL(pos);
}