function yaunclick()
{
alert('');
}
function noclick(scx)
{
if (navigator.appName == "Netscape" && scx.which == 3)
{
yaunclick();
return false; 
}
if (navigator.appVersion.indexOf("MSIE") != -1 && event.button == 2)
{
yaunclick();
return false; 
}
}
document.onmousedown = noclick