window.onload=function(){
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				if(!document.getElementById)return?false;
				if(!document.getElementsByTagName)return?false;
				if(!document.getElementById('imagegallery'))return?false;
				var?gallery=document.getElementById("imagegallery");
				var?links=gallery.getElementsByTagName('a');
				for(var?i=0;i<links.length;i++){?
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					????return?showPic(this)?false:true;
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			function?showPic(whichpic){
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				?var?source=whichpic.getAttribute('href');
				?var?placeholder=document.getElementById("placeHolder");
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		親愛的們，為什么我的代碼實現不了？？？?麻煩幫忙看下，謝啦?。。。ň幊趟囆g（第二版）中的第一段代碼練習）