disable the default context menu appears on right click of mouse

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MVC3

How to disable the default context menu appears on right click of mouse?

For this i am catching mousedown event like-
$(.mydiv).mousedown(function (event) {
switch (event.which) {
case 1:alert("left click ");
break;
case 2:alert("middle click ");
break;
case 3:
alert("right click");
event.preventDefault();
$(this).trigger('click');
break;
default:
alert("strange mouse");
}
});
by doing this it works fine, but i don't want to show alert on mouse click(this is happening becoz of ($(this.trigger('click')) so if i remove this alert then again it is showing the default context menu.