function GetWidth()
  {
    var x = 0;
    if (self.innerHeight)
    {
      x = self.innerWidth;
    }
    else if (document.documentElement && document.documentElement.clientHeight)
    {
      x = document.documentElement.clientWidth;
    }
    else if (document.body)
    {
      x = document.body.clientWidth;
    }
    return x;
  }

var x,w;
var sidepad = 200;
var picrail = 228;
var maxi    =   7;

w=GetWidth();

if(w > (picrail + sidepad))
{
  w = w - sidepad;
}

if(w > (maxi * picrail) )
{
  x = maxi * picrail;
}
else
{
  x = w - (w % picrail);
}

document.write('\n<style type=\"text/css\">\n')
document.write('div.ctr { width:' + x + 'px; }\n' );
document.write('</style>\n');