CSS制作水平导航菜单效果

startList = function() {
if (document.all&&document.getElementById) {
navRoot = document.getElementById("nav");
for (i=0; inode = navRoot.childNodes[i];
if (node.nodeName=="SPAN") {
node.onmouseover=function() {this.className+=" over";}
node.onmouseout=function() {this.className=this.className.replace(" over", "");}
}
}
}
}
window.onload=startList;