MX : Passing Variables to Command String

I’m trying to design an interface that to simplify the construction of a string. Here’s an example: My output (using the getURL command) needs to be in the form of:

http://fakesite.com:8080/java/submitdata.jsp?thing1=x&thing2=y&thing3=z

I’m able to define variables for x, y, and z, however I am unable to figure out how to substitute the defined values for those variables into the string when it is time to send it.

I may not be being very clear here, but does anyone have any ideas?

Thanks

Jeff Kirsch