functioninsertAfter(newElement,targetElement){//在已有元素后面插入一个新元素，属于通用型函数varparent=targetElement.parentNode;if(parent.lastChild==targetElement){parent.appendChild(newElement);}else{parent.insertBefore(newElement,targetElement.nextSibling);}}functionprepareGallery(){//遍历数组if(!document.getElementsByTagName)returnfalse;if(!document.getElementById)returnfalse;if(!document.getElementsByTagName||!document.getElementById){returnfalse;}vargallery=document.getElementById("p_w_picpathgallery");varlinks=gallery.getElementsByTagName("a");for(vari=0;i<links.length;i++){links[i].onclick=function(){return!showPic(this);}links[i].onkeypress=links[i].onclick;}}