var	nLetters = 0;
var inputBuf = new Array(10);
var maxInput = 0;
var isNav4, isIE4;

var ordMap = new Array(
	1, 2, 24, 5, 6, 22, 4, 25, 10, 11, 12, 13, 14, 15, 16, 17, 33, 18, 19, 20,
	21, 3, 26, 23, 29, 9 );

var oddStr = "`~-_=+[{]}\\|\'";
var oddMap = new Array( 27, 30, 28, 32, 8, 31, 7 );

function clearInput( nMax )
{
	var	i;

	nLetters = 0;
	maxInput = nMax;
	for (i=0; i<nMax; i++)
	{
		// str = "document.l" + i + ".src = \"ltr/d32.gif\"";
		// eval(str);
		document.images["l" + i].src = "ltr/d32.gif";
		document.images["c" + i].src = "ltr/d32.gif";
		inputBuf[i] = 0;
	}
}

function cleanupInput( )
{
	if (isNav4)
	{
		window.releaseEvents( Event.KEYPRESS );
	}
}

function setInput( nMax )
{
	if (parseInt(navigator.appVersion.charAt(0)) >= 4)
	{
		isNav4 = (navigator.appName == "Netscape");
		isIE4 = (navigator.appName.indexOf("Microsoft") != -1);
	}
	if (isNav4)
	{
		window.captureEvents( Event.KEYPRESS );
		window.onKeyPress = kpress;
	}
	else if (isIE4)
	{
		document.onkeypress = kpress;
	}
	clearInput( nMax );
}

function kclick(n)
{
	var	i, valid;

	if (nLetters < maxInput)
	{
		valid = false;
		i = 0;
		while ( validMap[i] != -999 )
		{
			if (validMap[i] == n) { valid = true; break; }
			i++;
		}
		if (!valid)
		{
			return;
		}
		inputBuf[nLetters ] = n;
		if (n > 0)
		{
			str = "document.l" + nLetters + ".src=\"ltr/s" + n + ".gif\"";
		}
		else
		{
			n = -n;
			str = "document.l" + nLetters + ".src=\"ltr/d" + n + ".gif\"";
		}
		eval(str);
		nLetters++;
	}
}

function kpress( theEvent )
{
	var charCode = (navigator.appName == "Netscape") ? theEvent.which :
		window.event.keyCode;
	var n, str;

	/* handle control codes */

	if (charCode == 13 || charCode == 10)
	{
		entered();
		return true;
	}
	else if (charCode == 8 || charCode == 127)
	{
		bksp();
		return true;
	}
	else if (charCode < 32 || charCode >= 128)
	{
		return true;
	}
	
	/* now handle everything "normal" */

	if (charCode >= 97 && charCode <= 122)
	{
		charCode -= 32;
	}
	if (charCode >= 65 && charCode <= 90)
	{
		n = ordMap[charCode - 65];
	}
	else
	{
		str= String.fromCharCode( charCode );
		n = oddStr.indexOf( str );
		if (n >= 0)
		{
			n = oddMap[Math.floor( n / 2 )];
		}
		else
		{
			n = -charCode;
		}
	}
	kclick(n);
	return true;
}


function bksp()
{
	if (nLetters > 0)
	{
		nLetters--;
		str = "document.l" + nLetters + ".src = \"ltr/d32.gif\"";
		inputBuf[nLetters] = 0;
		eval(str);
	}
}