我用javascript做了一个不被允许点右键的操作

代码如下：

echo "<script language=\"javascript\">

function showpicture$cid0(){

var owin=window.open(\"showpicture.html\",\"_blank\",\"top=0,left=40,width=900,height=700,toolbar=no\");

var char=document.images['img$cid0'].src;

owin.document.write(\"<img src=\"+char+\">\");

owin.document.write(\"<\script language='javascript' for='document' event='oncontextmenu'>\");

owin.document.write(\"window.event.returnValue=false;\");

owin.document.write(\"</\script>\");

}

</script>";

<SCRIPT language=javascript>

function click() {if (event.button==2) {alert('不许你偷看！');}}document.onmousedown=click

</SCRIPT>