Calling two variables in a Formula URL Field

I have a Formula URL field whose two formulas are as follows:

var text URLONE = "javascript:void(copyMasterDetailButtonHandler('&recurse=false&copyFid=117&destrid=0&sourcerid=" & [Record ID#] & "', 'mydbid'))"

and

var text URLTWO = "https://me.quickbase.com/db/homedbid?act=API_SetDBVar";
    & "&varname=" & URLEncode("lQnum")
    & If($da<>[lQda],
    "&value=" & URLEncode("02"),
    If(ToNumber($y)<9,
    "&value=" & URLEncode("0" & ToText(ToNumber($y)+1)),"&value=" & URLEncode(ToText(ToNumber($y)+1))));

By executing $URLONE or $URLTWO, they work fine.  Combining them so that they execute in order gives me the error - Uncaught ReferenceError: Invalid left-hand side in assignment

$URLONE & "&rdr=" & URLEncode($URLTWO)

What am I doing wrong?

Thank you!