URL Parameters for Width and Height

Is it possible to set the product size (width and height) with URL parameters? I would like to provide a link from our site that opens the designer at the size specified in the URL.

An example would be something like this:
http://designer.realtimedesigner.com/fastestbanner?ovrd_width=36&ovrd_height=36

It is obviously no problem for fixed sized products, as there each size has a unique link.
In any case, easiest way to get the link for a specific size, no matter if ranged of fixed, is browsing your catalog, starting here:
http://designer.realtimedesigner.com/fastestbanner/catalog/

By unsing the "more info" button when selecting product you will land in pages like this:
http://designer.realtimedesigner.com/fastestbanner/catalog/index.php&ignore_jump=1&p=cGM9MTQ4MjUmcGMyPSZwcj04MTQ4NA==
Selecting a size and hitting "GO!" will send you to the unique correct link to open the deisgner with such size.

Thank you for the reply. Whet we are trying to accomplish is to have a price calculator on the main site that will give the cost for a banner at the size they specify. They can then click a button to get started. Ideally that URL would take them to the custom banner page linked above and set the size dynamically. This would need to be a flazible option and not a fixed URL.

If it's not possible, that's fine, we'll proceed and give instructions for them to set the size in the designer.

Just in case, have you considered the use of the instant procug tool?
That can be found under the "INSTANT PRICING" section of the Your RTD Links & Builders area in admin panel