function nof5(){
if(window.frames&&window.frames[0]){
window.frames[0].focus();
for (var i_tem = 0; i_tem < window.frames.length; i_tem++)
if(document.all&&document.body.filters)
window.frames[i_tem].document.onkeydown=new Function("var e=window.frames["+i_tem+"].event; if(e.keyCode==116){e.keyCode=0;return false;};");
else if(document.getElementById)
window.frames[i_tem].onkeypress=new Function("e","if(e.keyCode==116){e.preventDefault();e.stopPropagation();}")
}
}

if(window.frames&&window.frames[0]){
window.frames[0].focus();
for (var i_tem = 0; i_tem < window.frames.length; i_tem++)
if(document.all&&document.body.filters)
window.frames[i_tem].document.onkeydown=new Function("var e=window.frames["+i_tem+"].event; if(e.keyCode==116){e.keyCode=0;return false;};");
else if(document.getElementById)
window.frames[i_tem].onkeypress=new Function("e","if(e.keyCode==116){e.preventDefault();e.stopPropagation();}")
}