var panels = new Array('panel1', 'panel2', 'panel3');
var selectedTab = null;
function showPanel(tab, name) {
  if (selectedTab) {
    selectedTab.style.backgroundColor = '';
    selectedTab.style.paddingTop = '';
    selectedTab.style.paddingBottom = '';
  }
  selectedTab = tab;
  selectedTab.style.backgroundColor = 'white';
  selectedTab.style.paddingTop = '6px';
  selectedTab.style.marginTop = '0px';
    for(i = 0; i < panels.length; i++) {
      document.getElementById(panels[i]).style.display = (name == panels[i]) ? 'block':'none';
    }
  return false;
}