Detect URLRequest variable change?

[cancerinform]

You create a variable somewhere at the beginning of your script:
var varChanged:String = "";
Then after this line you write:
var gamertagText = evt.target.data.gamertag;
if(varChanged != null && varChanged != gamertagText)
{
trace("no");
}
else if(varChanged == gamertagText)
{
trace("yes");
}
varChanged = gamertagText;