javascript function with defoult params

fun_func.js

function f(func){
	var func_str = func.toString();
	var params = func_str.match(/\((.+)\)/)[1].split(',');
	var params_str = '';
	for(var key in params){
		var parsed_param = params[key].match(/(.+)(\/\*)(.+)(\*\/)/);
		params_str += "var "+parsed_param[1]+"= (typeof "+parsed_param[1]+" == 'undefined' )?"+parsed_param[3]+":"+parsed_param[1]+";\n";
	}
	func_str = func_str.replace(/\{/, '{\n\t' + params_str);
	eval("var fun = "+func_str);
	return fun;
};


var ragaca = f(function(name/*'cotne'*/,lastname/*'nazarashvili'*/){
	alert(name +' '+ lastname);
});