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;
}