var tabs = new Array();
tabs[0] = "T1";
tabs[1] = "T2";
tabs[2] = "T3";
function flipContent(TAB_ID) {

  for (k=0;k<tabs.length;k++) {
    if (tabs[k] == TAB_ID) {
      document.getElementById(tabs[k]).style.display = "block";
      document.getElementById(tabs[k] + '_link').className = 'big_link_on';
    } else {
      document.getElementById(tabs[k]).style.display = "none";
      document.getElementById(tabs[k] + '_link').className = 'big_link';
    }
  }
}