function tableRuler() {

  if (document.getElementById) { 
    tables = document.getElementsByTagName('table')
    for (i=0;i<tables.length;i++) {

      if (tables[i].className == 'ruler') { 
        trs = tables[i].getElementsByTagName('tr')

        for (j=0;j<trs.length;j++) {

          if (trs[j].className != 'header') {

            trs[j].onmouseover = function() { this.className = 'line';  
return false }
            trs[j].onmouseout = function() { this.className = '';  
return false }
          }
        }
      }
    }
  }
}