Simple template rendering for Javascript

render.js

/* Simple JS template rendering function */
function render(obj, template) {
    var re, v;
    re = new RegExp("\\[\\[([^\\]]+)\\]\\]");
    while (match = re.exec(template)) {
        val = obj[match[1]] || '';
        template = template.replace(match[0], val);
    }
    return template;
}


/* sample call to the function */
var template = '<div class="[[classname]]"><span>[[firstname]] [[lastname]]</span><br><span>[[message]]</span></div>';
var obj = { firstname:"Randy", lastname:"Hunt", message:"Hello world!", classname="display" };
document.write(render(obj, template));

/* OUTPUT:
    <div class="display">
        <span>Randy Hunt</span><br>
        <span>Hello World!</span>
    </div>
*/