function clickIE() {
if (document.all) {
return false;}}
function clickNS(e) {
if (document.layers||(document.getElementById&&!document.all)) {
if (e.which==2||e.which==3) {
return false;
}}}
if (document.layers) 
{
document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS;
}else{
document.onmouseup=clickNS;
document.oncontextmenu=clickIE;
}
document.oncontextmenu=new Function("return false")