Link to an external file or to an url adress

Hello everybody, I´m using joodb and it´s working well. But I want to put a link in the image in the view catalog to open an external file o an url. Here is my web page´s link:
www.documentacionconservacionrestauracio...mitstart=30&limit=10

I want to put a link when you put the mouse over the picture. The lin will be diferent for each picture.
But I don´t know how to do it, if it´s possible. So I ask you for help, please.
Thank a lot.

Anybody have an idea how to do what I want? How can I put a link in each image? Is it possible? A solution could be to create a new field in y database and put a link there. But in my opinion it's more profesional when you pass the mouse over the picture and you have the possibility to clic on it to open a link with more information. Please could you help me?

Best you use the internal system for item images. So you can use
{joodb image} and {joodb thumb}

If you have the complete url to the external websites in a field e.g. (weburl) the sytax would be.