var rowWithMouse = null;

    function isElemBox(elem) {      // true if element is a relevant checkbox      return (elem.id.indexOf("box_") == 0);
    }

    function getRowFromBox(box) {      var row = null;      if (box.parentNode && box.parentNode.parentNode) {
        row = box.parentNode.parentNode;      } else if (box.parentElement && box.parentElement.parentElement) {
        row = box.parentElement.parentElement;
      }
      if (row != null && row.id.indexOf('tr_') == 0) {        return row;
      }
      return document.getElementById('tr_' + box.id.substr(4));
    }

    function rowUpdateBg(row, box) {      if (box && box.checked) {        row.style.backgroundColor = "#FfFfFf";      } else {
        row.style.backgroundColor = (row == rowWithMouse) ? '#FfFfFf' : '#F0F0F0';      }
    }

    function rowSelect(row, box) {      box.checked = true;      if(row) { 	rowUpdateBg(row, box);       }
    }

    function rowUnselect(row, box) {      box.checked = false;      if(row) { 	rowUpdateBg(row, box);      }
    }

    function rowRollover(myId, isInRow) {      // myId is our own integer id, not the DOM id
	      var row = document.getElementById('tr_' + myId);      var box = document.getElementById('box_' + myId);      rowWithMouse = (isInRow) ? row : null;       rowUpdateBg(row, box);
    }

    function isAllSelected(f) {      for (var i=0; i < f.elements.length; i++) {        var box = f.elements[i];        if (isElemBox(box) && box.checked == false) {          return false;        }      }
      return true;
    }

    function rowToggle(myId) {      var row = document.getElementById('tr_' + myId);      var box = document.getElementById('box_' + myId);
      var f = box.form;      if (box.checked == false) {        rowSelect(row, box);        f.toggleAll.checked = isAllSelected(f);
      } else {        rowUnselect(row, box);        f.toggleAll.checked = false;      }
    }

    function rowToggleAll(tabox) {      var f = tabox.form;      for (var i=0; i < f.elements.length; i++) {        var box = f.elements[i];
        if (isElemBox(box) && box.checked != tabox.checked) {          var row = getRowFromBox(box);          if (tabox.checked) {
            rowSelect(row, box);          } else {            rowUnselect(row, box);          }        }      }
    }

    function initRolloverTables() {      for (var i=0; i < document.forms.length; i++) {        var f = document.forms[i];        if (f.className == 'rollover' && f.toggleAll) {          for (var j=0; j < f.elements.length; j++) {            var box = f.elements[j];            if (isElemBox(box) && box.checked == true) {              var row = getRowFromBox(box);              rowUpdateBg(row, box);            }
          }
          f.toggleAll.checked = isAllSelected(f);        }      }
    }

    var rolloverWarning = null;    
	function beforeRolloverSubmit(f, msg) {      var numElemBoxes = 0;      for (var i=0; i < f.elements.length; i++) {        var box = f.elements[i];
        if (isElemBox(box)) {          numElemBoxes++;          if (box.checked == true) {            if (rolloverWarning) {              var r =confirm(rolloverWarning);              rolloverWarning = null;              return r;            }            return true;          }        }
      }
      if (numElemBoxes == 1) {         f.toggleAll.checked = true;        rowToggleAll(f.toggleAll);        if (rolloverWarning) {          var r = confirm(rolloverWarning);          rolloverWarning = null;          return r;        }                return true;
      }
      alert(msg);      rolloverWarning = null;      return false;
    }