/* rollOver() */

function rollOver(iName, iState)
{
  if(document.images && self[iName + '_' + iState])
    document.images[iName].src = self[iName + '_' + iState].src;
}

function onLoad()
        {
          preLoad('omimg1','omimg2', 'omimg3', 'omimg4');
        }
        
        window.onload = onLoad;