isNN = document.layers ? 1 : 0; 
        
function noContext(){return false;}

function noContextKey(e)
	{
	if(isNN){
	    if (e.keyCode == 96){ return (false);}
		} else {
	    if (event.keyCode == 96){ return (false);}
		}
	}

function noClick(e)
	{
	if(isNN)
		{
	    if(e.which > 1) {return false;}
		} else { 
	    //if(e.button > 1){return false;}
		}
	}

if(isNN)
	{ 
	 document.captureEvents(Event.MOUSEDOWN);
	}

function winstat(sMsg)
	{
    window.status = sMsg;
    return true;
	}

function IsANumber(entry)
	{
	validChar = '0123456789';				// characters allowed in hex
	strlen = entry.length;					// how long is test string
	if (strlen < 1) { return false;}		// no check!
	entry = entry.toUpperCase();			// in case of lowercase characters

	for (i=0; i < strlen; i++ )
		{
	    if (validChar.indexOf(entry.charAt(i)) < 0)
			{
			return false;
			}
	    } // end scanning loop
	    
	return true;
	}