function printf(fstring)
{ var pad = function(str,ch,len)
	{ var ps='';
		for(var i=0; i<Math.abs(len); i++) ps+=ch;
		return len>0?str+ps:ps+str;
	}
	var processFlags = function(flags,width,rs,arg)
	{ var pn = function(flags,arg,rs)
		{ if(arg>=0)
			{ if(flags.indexOf(' ')>=0) rs = ' ' + rs;
			else if(flags.indexOf('+')>=0) rs = '+' + rs;
			}
		else
			rs = '-' + rs;
			return rs;
		}
		var iWidth = parseInt(width,10);
		if(width.charAt(0) == '0')
		{ var ec=0;
			if(flags.indexOf(' ')>=0 || flags.indexOf('+')>=0) ec++;
			if(rs.length<(iWidth-ec)) rs = pad(rs,'0',rs.length-(iWidth-ec));
			return pn(flags,arg,rs);
		}
		rs = pn(flags,arg,rs);
		if(rs.length<iWidth)
		{ if(flags.indexOf('-')<0) rs = pad(rs,' ',rs.length-iWidth);
		else rs = pad(rs,' ',iWidth - rs.length);
		}
		return rs;
	}
	var converters = new Array();
	converters['c'] = function(flags,width,precision,arg)
	{ if(typeof(arg) == 'number') return String.fromCharCode(arg);
		if(typeof(arg) == 'string') return arg.charAt(0);
		return '';
	}
	converters['d'] = function(flags,width,precision,arg)
	{ return converters['i'](flags,width,precision,arg);
	}
	converters['u'] = function(flags,width,precision,arg)
	{ return converters['i'](flags,width,precision,Math.abs(arg));
	}
	converters['i'] =  function(flags,width,precision,arg)
	{ var iPrecision=parseInt(precision);
		var rs = ((Math.abs(arg)).toString().split('.'))[0];
		if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
		return processFlags(flags,width,rs,arg);
	}
	converters['E'] = function(flags,width,precision,arg)
	{ return (converters['e'](flags,width,precision,arg)).toUpperCase();
	}
	converters['e'] =  function(flags,width,precision,arg)
	{ iPrecision = parseInt(precision);
		if(isNaN(iPrecision)) iPrecision = 6;
		rs = (Math.abs(arg)).toExponential(iPrecision);
		if(rs.indexOf('.')<0 && flags.indexOf('#')>=0) rs = rs.replace(/^(.*)(e.*)$/,'$1.$2');
		return processFlags(flags,width,rs,arg);
	}
	converters['f'] = function(flags,width,precision,arg)
	{ iPrecision = parseInt(precision);
		if(isNaN(iPrecision)) iPrecision = 6;
		rs = (Math.abs(arg)).toFixed(iPrecision);
		if(rs.indexOf('.')<0 && flags.indexOf('#')>=0) rs = rs + '.';
		return processFlags(flags,width,rs,arg);
	}
	converters['G'] = function(flags,width,precision,arg)
	{ return (converters['g'](flags,width,precision,arg)).toUpperCase();
	}
	converters['g'] = function(flags,width,precision,arg)
	{ iPrecision = parseInt(precision);
		absArg = Math.abs(arg);
		rse = absArg.toExponential();
		rsf = absArg.toFixed(6);
		if(!isNaN(iPrecision))
		{ rsep = absArg.toExponential(iPrecision);
			rse = rsep.length < rse.length ? rsep : rse;
			rsfp = absArg.toFixed(iPrecision);
			rsf = rsfp.length < rsf.length ? rsfp : rsf;
		}
		if(rse.indexOf('.')<0 && flags.indexOf('#')>=0) rse = rse.replace(/^(.*)(e.*)$/,'$1.$2');
		if(rsf.indexOf('.')<0 && flags.indexOf('#')>=0) rsf = rsf + '.';
		rs = rse.length<rsf.length ? rse : rsf;
		return processFlags(flags,width,rs,arg);
	}
	converters['o'] = function(flags,width,precision,arg)
	{ var iPrecision=parseInt(precision);
		var rs = Math.round(Math.abs(arg)).toString(8);
		if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
		if(flags.indexOf('#')>=0) rs='0'+rs;
		return processFlags(flags,width,rs,arg);
	}
	converters['X'] = function(flags,width,precision,arg)
	{ return (converters['x'](flags,width,precision,arg)).toUpperCase();
	}
	converters['x'] = function(flags,width,precision,arg)
	{ var iPrecision=parseInt(precision);
		arg = Math.abs(arg);
		var rs = Math.round(arg).toString(16);
		if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
		if(flags.indexOf('#')>=0) rs='0x'+rs;
		return processFlags(flags,width,rs,arg);
	}
	converters['s'] = function(flags,width,precision,arg)
	{ var iPrecision=parseInt(precision);
		var rs = arg;
		if(rs.length > iPrecision) rs = rs.substring(0,iPrecision);
		return processFlags(flags,width,rs,0);
	}
	farr = fstring.split('%');
	retstr = farr[0];
	fpRE = /^([-+ #]*)(\d*)\.?(\d*)([cdieEfFgGosuxX])(.*)$/;
	for(var i=1; i<farr.length; i++)
	{ fps=fpRE.exec(farr[i]);
		if(!fps) continue;
		if(arguments[i]!=null) retstr+=converters[fps[4]](fps[1],fps[2],fps[3],arguments[i]);
		retstr += fps[5];
	}
	return retstr;
}