function clickIE4(){if(event.button==2){return false;}}
function clickNS4(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=clickNS4;}
else if(document.all&&!document.getElementById){document.onmousedown=clickIE4;}
document.oncontextmenu=new Function("return false");