Changing external Images depending on values in qlikview

[#1]

I want to change images depending on values in qlikview. I prepared 3 png Images: red, yellow and green.

I created a textbox (representation as image) and put the following code in it:
=if(FIELD1) < 0.01,'images\green.png',if(FIELD1 > 0.10,'images\red.png','images\yellow.png'))

That worked really fine in qlikview and in the internex explorer plugin - but when using ajax no image ist shown anymore!
Because in our company many users want to have ajax, i have to find another solution for that.

Thats why i tried different things:

1. BUNDLE INFO LOAD * INLINE [
Image, Pfad
yellow, yellow.png
green, green.png
red, red.png
];

That is working, but i have no chance to change the images automatically with an if clause. The images exists in the qlikview file, but i cannot use them like the integrated icons (qmem://<builtin>/...)

Question: Is there a chance to import external images and to use them like the integrated icons?

2. I tried to create 3 different textboxes with the three different images and put them on exactly the same positon (like NMiller told here http://community.qlik.com/forums/p/16212/63311.aspx). I created variables and wanted to show the images depending on the variables.

Question: How to change the variable with and if..then clause?? Where do i have to put this code to?

Thanks for your help!