// This allows the keyword cloud to be filtered.
// copyright 2008 Mick Ashby - all rights reserved.


function filterKeywords(limitvalue)
{
var color=new Array("color0","color1")
var n=1;
for (var i=1;i<=678;i++)
  {
  with(document.getElementById(String(i)))
    {
    if (Number(getAttribute("nrefs"))<limitvalue)
         { style.display="none" }

    else { style.display="inline";
           className=color[n];
           n=1-n;
         }
    }
  }
}