//设置透明度

function setOpacity(node,level){

node=typeof node=="string"?document.getElementById(node):node;

if(document.all){

node.style.filter='alpha(opacity='+level+')';

}else{

node.style.opacity=level/100;

}

}

//阻止冒泡

function stopPropagation(e){

e=window.event||e;

if(document.all){

e.cancelBubble=true;

}else{

e.stopPropagation();

}

}

//使用attachEvent和addEventListener代替on xxx

function on(node,eventType,handler){

node=typeof node=="string"?document.getElementById(node):node;

if(document.all){

node.attachEvent("on"+eventType,handler);

}else{

node.addEventListener(eventType,handler,false);

}

}