browserName=navigator.appName;browserVer=parseInt(navigator.appVersion);ns3up=(browserName=="Netscape"&&browserVer>=3);ie4up=(browserName.indexOf("Microsoft")>=0&&browserVer>=4);mymessage="Desculpe, este comando está bloqueado."
function disableRightClick(btnClick)
{if(navigator.appName=="Internet Explorer"&&btnClick.which==3)
{alert(mymessage);return false;}
else if(navigator.appName=="Microsoft Internet Explorer"&&event.button==2){alert(mymessage);return false;}
else if(navigator.appName=="Netscape"&&btnClick.which==3){alert(mymessage);return false;}
else if(navigator.appName=="Netscape"&&event.button==2)
{alert(mymessage);return false;}}
document.onmousedown=disableRightClick;