image overlays - how difficult

i want to do something like this on my website but don't know how difficult it might be or how much it might cost.. something similar to the fabric viewer at http://www.polstitchesdesigns.co.uk/fabricviewer.htm. you select the first image (here it's the pattern) and then put a background image (the fabric here) behind that image to show the customer what their product would look like.

 

They are using Adobe Frameworks and back end coding in Asp.Net .

 

All you really need for this is a transparent image for the foreground as the background of a DIV inside another DIV with the background on it.

<div id="bgImage"><div id="fgImage"></div></div>

#fgImage { width:160px; height:240px; }

Just add a 'onchange' script handler to the SELECT tag to give #bgImage the background and #fgImage it's foreground -- alongside the proper alignments.

 

could you do something like this and how much would it cost.