var panels = new Array('panel1', 'panel2', 'panel3', 'panel4', 'panel5', 'panel6'); // IDs of the content panels must be put here
    var tabs = new Array('tab1', 'tab2', 'tab3', 'tab4', 'tab5', 'tab6'); // IDs of the tabs must be put here
    function displayPanel(nval)
    {
         for(i = 0; i < panels.length; i++)
         {
             document.getElementById(panels[i]).style.display = (nval-1 == i) ? 'block':'none';
             document.getElementById(tabs[i]).className=(nval-1 == i) ? 'tab_sel':'tab';
         }
    }