function click() {
if (event.button==2) {
alert('Right Click Disabled');
}
}
document.onmousedown=click

function mouseOver1()
{
document.getElementById("b1").src ="images/button_5.png";
}
function mouseOut1()
{
document.getElementById("b1").src ="images/button_4.png";
}
function mouseOver2()
{
document.getElementById("b2").src ="images/button_5.png";
}
function mouseOut2()
{
document.getElementById("b2").src ="images/button_4.png";
}
function mouseOver3()
{
document.getElementById("b3").src ="images/button_5.png";
}
function mouseOut3()
{
document.getElementById("b3").src ="images/button_4.png";
}