替换页面中全部图片

<script>
var imgs=0;
function showmenu(){
	if(imgs==0){
		imgs=1;
		for(var i=0; total=document.images.length,i<total; i++){
			document.getElementsByTagName("img")[i].oldsrc=document.getElementsByTagName("img")[i].src;
			document.getElementsByTagName("img")[i].width=document.getElementsByTagName("img")[i].width;
			document.getElementsByTagName("img")[i].height=document.getElementsByTagName("img")[i].height;
			document.getElementsByTagName("img")[i].src="http://images.yoka.com/pic/index/2008/1209/U15P1T46D827F728DT20081209153649.jpg";
		}
	}else{
		imgs=0;
		for(var i=0; total=document.images.length,i<total; i++){
			document.getElementsByTagName("img")[i].src=document.getElementsByTagName("img")[i].oldsrc;
		}
	}
}
</script>

<span style="cursor:pointer;" onclick="showmenu()">替换</span>