Disabling mouse clicks

[llp00na]

well, i am setting up a controlled experiment. I will need to disable both left and right mouse clicks.

I have tried :

<SCRIPT LANGUAGE="javascript">

function click() {
if (event.button==1 || event.button==2) {
alert('No clicking!')
}
}
document.onMouseDown=click

</SCRIPT>


But it doesnt work, can someone please provide advice. Thanx