//Rollover
cat_blue_asset_on = new Image ( );
cat_blue_asset_off = new Image ( );
cat_blue_asset_on.src = "/modules/e3_2009/images/blue_asset1a.jpg";
cat_blue_asset_off.src = "/modules/e3_2009/images/blue_asset.jpg";

cat_blue_fact_on = new Image ( );
cat_blue_fact_off = new Image ( );
cat_blue_fact_on.src = "/modules/e3_2009/images/blue_factsheet1a.jpg";
cat_blue_fact_off.src = "/modules/e3_2009/images/blue_factsheet.jpg";

cat_brown_asset_on = new Image ( );
cat_brown_asset_off = new Image ( );
cat_brown_asset_on.src = "/modules/e3_2009/images/brown_asset1a.jpg";
cat_brown_asset_off.src = "/modules/e3_2009/images/brown_asset.jpg";

cat_brown_fact_on = new Image ( );
cat_brown_fact_off = new Image ( );
cat_brown_fact_on.src = "/modules/e3_2009/images/brown_factsheet1a.jpg";
cat_brown_fact_off.src = "/modules/e3_2009/images/brown_factsheet.jpg";

function roll ( cat, button, onoff, target )
{
  if ( document.images )
  {
    var but = eval ( "cat_" + button + "_" + cat + "_" + onoff + ".src" );
    document.getElementById(target).src = but;
  } 
}