var cacheImg1 = new Image();
var cacheImg2 = new Image();
var cacheImg3 = new Image();
var cacheImg4 = new Image();
cacheImg1.src = 'image/newbt_b01.jpg';
cacheImg2.src = 'image/newbt_b02_click.jpg';
cacheImg3.src = 'image/newbt_b03_click.jpg';
cacheImg4.src = 'image/newbt_b04_click.jpg';
function selectTag(showContent,selfObj, selectorIdNum){
	// 操作標簽
	var tag = document.getElementById("tags").getElementsByTagName("td");
	var taglength = tag.length;
	for(i=0; i<taglength; i++){
		tag[i].className = "";
	}
	//selfObj.parentNode.className = "selectTag";
	
	// 操作內容
	for(i=0; j=document.getElementById("tagContent"+i); i++){
		j.style.display = "none";
	}
	document.getElementById(showContent).style.display = "block";
	clearTagSelector();
	document.getElementById('tagSelector' + selectorIdNum).src='image/newbt_b0' + selectorIdNum + '_click.jpg';
}
function clearTagSelector() {
	var el;
	el = document.getElementById('tagSelector1');
	el.src = 'image/newbt_b01.jpg';
	el = document.getElementById('tagSelector2');
	el.src = 'image/newbt_b02.jpg';
	el = document.getElementById('tagSelector3');
	el.src = 'image/newbt_b03.jpg';
	el = document.getElementById('tagSelector4');
	el.src = 'image/newbt_b04.jpg';
}