web禁止右键和复制网页的代码

web禁止右键和复制网页的代码：
适合各个浏览器，挺好用的。
$str=<<<EOF
<style type="text/css">
body{
-moz-user-select : none;
-webkit-user-select: none;
}
</style>
<script type="text/javascript">
function iEsc(){ return false; }
function iRec(){ return true; }
function DisableKeys() {
if(event.ctrlKey || event.shiftKey || event.altKey)  {
window.event.returnValue=false;
iEsc();}
}
document.ondragstart=iEsc;
document.onkeydown=DisableKeys;
document.oncontextmenu=iEsc;
if(typeof document.onselectstart !="undefined")
document.onselectstart=iEsc;
else{//qsyz.net
document.onmousedown=iEsc;
document.onmouseup=iRec;
}
function DisableRightClick(www_qsyz_net){
if (window.Event){
if (www_qsyz_net.which == 2 || www_qsyz_net.which == 3)
iEsc();
}
else
{
if (event.button == 2 || event.button == 3){
event.cancelBubble = true
event.returnValue = false;
iEsc();
}
}
}
</script>
EOF;
return $str;