How can I overlay a string on an image?

[valeeum]

I'm trying the following code and getting an error that image does not have method string. Can someone tell me what the proper way of doing this? Thanks!

var image = gd.create(125, 125);
var color = image.colorAllocate(0, 0, 255);
image.string(1, 5, 5, 'A Simple Text String', color);

This is the error I'm getting:
image.string(1, 5, 5, 'A Simple Text String', color);
^
TypeError: Object [object Object] has no method 'string'