全局Javascript对象如何保存状态？

/**************************************************************************
 *
 * Function:    toggleVis
 *
 * Description: Following Function hides and expands the main column.
 *              
 *
***************************************************************************/
// Set the default "show" mode to that specified by W3C DOM
// compliant browsers

  var showMode = 'table-cell';


// However, IE5 at least does not render table cells correctly
// using the style 'table-cell', but does when the style 'block'
// is used, so handle this

  if (document.all) showMode='block';

// This is the function that actually does the manipulation

var States = { };

function toggleVis(col){

    if (!States[col] || States[col].IsOpen == null)
    {
        States[col] = {isOpen : true}; // This assumes the cell is already shown
        //States[col] = {isOpen : false}; // This assumes the cell is already hidden
    } 

    //mode =  States[col].IsOpen ? showMode : 'none';
    mode =  States[col].IsOpen ? 'none' : showMode; //starts from closed, next click need open

    cells = document.getElementsByName(col);
    for(j = 0; j < cells.length; j++) cells[j].style.display = mode;

    States[col].IsOpen = !States[col].IsOpen;
}
/**********************************************