Url Image Field Deluge Update

Good day,

I have a product catalogue, each item have a Url Image, I want to update the Url Value with Deluge when every new product is created, I use the same syntax to feed a url on a plain field but in the Url Image field nothing happens.

iniciolink = "<a href=";

mediolink = (" target=_blank>");

finallink = "</a>";

thumblink1 = " http://www.zhingenieros.com/zoho/productthumbnails/";

thumblink2 = ".jpg";

thumblink = thumblink1 + "1" + thumblink2;

input.Image = iniciolink + thumblink + mediolink + thumblink + finallink;