Autolinking strings in JS

autolink.js

function autolink(str, attributes)
{
	attributes = attributes || {};
	var attrs = "";
	for(name in attributes)
		attrs += " "+ name +'="'+ attributes[name] +'"';
	
	var reg = new RegExp("(\\s?)((http|https|ftp)://[^\\s<]+[^\\s<\.)])", "gim");
	str = str.toString().replace(reg, '$1<a href="$2"'+ attrs +'>$2</a>');
	
	return str;
}