右击鼠标弹出图片另存为对话框

<script>
function getimg() {
event.returnValue=false;
show.window.location.href=../../event.srcElement.src;
timer=setInterval(checkload,100)
}
function checkload(){
if(show.readyState!="complete")
{show.document.execCommand("SaveAs");
  clearInterval(timer)}
}

</script>
<img src="http://www.webjx.com/htmldata/2006-02-19/xxx" oncontextmenu="getimg()">
<iframe src=http://www.webjx.com/htmldata/2006-02-19/"" name=show style="width:0;height:0"></iframe>

利用一个框架保存图片，然后可以执行savaas命令