var _t1 = 0; 
var _t2 = 5; 
var _tnum = 2; 
var _tn = 1;
var _tl =null;
_tt1 = setTimeout('change_img()',_t1*1000);
function change_img(){
setFocus(_tn);
_tt1 = setTimeout('change_img()',_t2*1000);
}
function setFocus(i){
if(i>_tnum){_tn=1;i=1;}
_tl?document.getElementById('focusPic'+_tl).style.display='none':'';
document.getElementById('focusPic'+i).style.display='block';
_tl=i;
_tn++;
}

function selectTag(showContent,selfObj){
	// ²Ù×÷±êÇ©
	var tag = document.getElementById("tags").getElementsByTagName("li");
	var taglength = tag.length;
	for(i=0; i<taglength; i++){
		tag[i].className = "";
	}
	selfObj.parentNode.className = "li_a";
	// ²Ù×÷ÄÚÈÝ
	for(i=0; j=document.getElementById("tagContent"+i); i++){
		j.style.display = "none";
	}
	document.getElementById(showContent).style.display = "block";
}