var iPath = '../../media/header/';
        var iExt = 'jpg';
        var loaded = false;
        var suffix = new Array('off', 'region_01', 'region_02', 'region_03', 'region_04', 'region_05', 'region_06', 'region_07', 'region_08', 'region_09', 'region_10');

        function preLoad()
        {
          if(document.images)
          {
            var argLen = arguments.length;
            for(var i = 0; i < argLen; i++)
            {
              var arg = arguments[i];
              var sufLen = suffix.length;
              for(j = 0; j < sufLen; j++)
              {
                var suf = suffix[j];
                iNew = arg + '_' + suf + ' = new Image();';  eval(iNew);
                iSrc = arg + '_' + suf + '.src = \'' + iPath + arg + '_' + suf + '.' + iExt + '\';';  eval(iSrc);
              }
            }   
            loaded = true;
          }
        }

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

        preLoad('map');