//deshabilitar boton derecho
var message="boton derecho deshabilitado";
function clickIE() {if (document.all) {(message);return false;}}
function clickNS(e) {if 
(document.layers||(document.getElementById&&!document.all)) {
if (e.which==2||e.which==3) {(message);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")


//desactivar tecla ctrl
document.onkeydown = function(){ 
if(window.event && (window.event.keyCode == 122 || window.event.keyCode == 113 || window.event.ctrlKey)){
window.event.keyCode = 505; 
}
if(window.event.keyCode == 505){ 
return false; 
} 
} 

<!--
function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}
//-->



//