function sprintf()
{
	if (!arguments || arguments.length < 1 || !RegExp)
	{
		return;
	}
	var str = arguments[0];
	var re = /([^%]*)%('.|0|\x20)?(-)?(\d+)?(\.\d+)?(%|b|c|d|u|f|o|s|x|X)(.*)/;
			var a = b = [], numSubstitutions = 0, numMatches = 0;
			while (a = re.exec(str))
			{
				var leftpart = a[1], pPad = a[2], pJustify = a[3], pMinLength = a[4];
				var pPrecision = a[5], pType = a[6], rightPart = a[7];
				
				//alert(a + '\n' + [a[0], leftpart, pPad, pJustify, pMinLength, pPrecision);

	numMatches++;
	if (pType == '%')
	{
		subst = '%';
	}
	else
	{
		numSubstitutions++;
		if (numSubstitutions >= arguments.length)
		{
			alert('Error! Not enough function arguments (' + (arguments.length - 1) + ', excluding the string)\nfor the number of substitution parameters in string (' + numSubstitutions + ' so far).');
		}
		var param = arguments[numSubstitutions];
		var pad = '';
		if (pPad && pPad.substr(0,1) == "'") pad = leftpart.substr(1,1);
		else if (pPad) pad = pPad;
		var justifyRight = true;
		if (pJustify && pJustify === "-") justifyRight = false;
		var minLength = -1;
		if (pMinLength) minLength = parseInt(pMinLength);
		var precision = -1;
		if (pPrecision && pType == 'f') precision = parseInt(pPrecision.substring(1));
		var subst = param;
		if (pType == 'b') subst = parseInt(param).toString(2);
		else if (pType == 'c') subst = String.fromCharCode(parseInt(param));
		else if (pType == 'd') subst = parseInt(param) ? parseInt(param) : 0;
		else if (pType == 'u') subst = Math.abs(param);
		else if (pType == 'f') subst = (precision > -1) ? Math.round(parseFloat(param) * Math.pow(10, precision)) / Math.pow(10, precision): parseFloat(param);
		else if (pType == 'o') subst = parseInt(param).toString(8);
		else if (pType == 's') subst = param;
		else if (pType == 'x') subst = ('' + parseInt(param).toString(16)).toLowerCase();
		else if (pType == 'X') subst = ('' + parseInt(param).toString(16)).toUpperCase();
	}
	str = leftpart + subst + rightPart;
}
return str;
}