Lets Start...
Firstly login on ur blog and make sure u on Dashboard page.. Then, click on Design..
Login > Dashboard > Design
On Design of page element, u must add gadjet of HTML/JavaScript..
Choose gadjet of HTML/JavaScript...
Lastly, paste dis code.. and SAVE!
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<script language="JavaScript"><!--var message="Not allowed";///////////////////////////////////function clickIE4(){if (event.button==5){alert(message);return false;}}function clickNS4(e){if (document.layers||document.getElementById&&!document.all){if (e.which==4||e.which==5){alert(message);return false;}}}if (document.layers){document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS4;}else if (document.all&&!document.getElementById){document.onmousedown=clickIE4;}document.oncontextmenu=new Function("alert(message);return false")// --></script>
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Change the bold font to your messege..
DONE!!
DONE!!
That' s all.. simple and easy right? good luck frenss!! :)