Restrict User to Not to Right Click on Page

Add this script inside form tag

< script language="javascript" type="text/javascript" >
document.onmousedown = noRightClick
function noRightClick() {
    if (event.button == 2) {
        alert("Right Click Not Allowed!");
        return false;
    }
}
document.onmousedown = noRightClick
< /script >