startList = function() {
  // document.all is IE>=4.0 specific
  if ( document.all && document.getElementById ) {
    navRoot = document.getElementById( "nav_table_line" );
    for ( i=0; i<navRoot.childNodes.length; i++ ) {
      node = navRoot.childNodes[i];
      if ( node.nodeName == "TD" ) {
	node.onmouseover=function() {
	  this.className += " over";
	}
	node.onmouseout=function() {
	  this.className=this.className.replace( " over", "" );
	}
      }
    }
  }
}

window.onload=startList;