在已有元素后面插入一个新元素，属于通用型函数insertAfter(newElement,targetElement)...

function  insertAfter(newElement,targetElement){                   //在已有元素后面插入一个新元素，属于通用型函数
var  parent = targetElement.parentNode;
if (parent.lastChild == targetElement){
parent.appendChild(newElement);
} else {
parent.insertBefore(newElement,targetElement.nextSibling);
}
}

function  prepareGallery() {                             //遍历数组
if (!document.getElementsByTagName)  return  false ;
if (!document.getElementById)  return  false ;
if (!document.getElementsByTagName||!document.getElementById) {
 return  false ;
}
 var  gallery = document.getElementById( "imagegallery" );
 var  links = gallery.getElementsByTagName( "a" );
 for (  var  i=0; i < links.length; i++) {
 links[i].onclick =  function (){
 return  !showPic( this );
 }
 links[i].onkeypress = links[i].onclick;
 }
}

本文转自  小旭依然  51CTO博客，原文链接:http://blog.51cto.com/xuyran/1783590