Mouse Buttons

The following gives you the necessary information to identify which mouse button is pressed. Press a button to see which number goes bold

<script type="text/javascript">
<!--

if(document.layers){
document.captureEvents(Event.MOUSEDOWN);
}

function which_browser(e){

if(document.all){ // IE
alert(event.button)
}

if(document.getElementById&&!document.all){ // Moz NS7
alert(e.which)
}

if(document.layers){ // NS4
alert(e.which)
}

}
document.onmousedown=which_browser

// -->
</script>






if (event.button==2){
alert('You cannot Right-Click here.')
}

if (event.button==1){
alert('You cannot Left-Click here.')
}

if ((event.button==1)||(event.button==2)){
alert('You cannot Click here.')
}

Note:

Detect which button is clicked in firefox with the button property of the event passed to the handler
0 - left
1 - middle
2 - right
If the event's button value is not 0 (left button) you can use preventDefault() and stopPropagation() to halt the event processing.
It is best to use this on individual elements, and not the window object itself.