How to compare retrieved parameters (web_reg_save_param)

Here's an issue that I'm having. On the same page, I am retrieving two variables , PARAM1 & PARAM2. Depending on my actions, only one will be populated with a 7-digit number, the other will be an empty string.

web_reg_save_param( "PARAM1", "LB=xxx",
"RB=xxx",
"Ord=1", "IgnoreRedirections=Yes", "Notfound=warning", "Search=Body", "RelFrameId=1", LAST );

web_reg_save_param( "PARAM2", "LB=xxx",
"RB= xxx",
"Ord=1", "IgnoreRedirections=Yes", "Notfound=warning", "Search=Body", "RelFrameId=1", LAST );

How can I compare the 2 values, so that I can use a if/else clause to control the following actions?

I'd appreciate any feedback. Thanks!