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; }
clickmenu=false; document.oncontextmenu=new Function("if (!clickmenu) return false;");