function tabMove () {
	var tab = document.getElementById("tabs");
	var links = tab.getElementsByTagName("a");
		links[0].onclick = function () {
			$('tab1').className = "active";
			$('tab2').className = "off";
			$('content1').className = "content show";
			$('content2').className = "content hide";
			return false;
		}
		links[1].onclick = function () {
			$('tab1').className = "off";
			$('tab2').className = "active";
			$('content1').className = "content hide";
			$('content2').className = "content show";
			return false;
		}
	
}
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}
addLoadEvent(tabMove);