How to write this in selenium IDE

Any suggestion how I write this in Selenium IDE ?
I need to have multible variables stored from one step with the storeEval command.
I use the inline function as below. 
Problem seems that the Value field can only define one variable and as setup the result sets the variable to NULL.

(function setVars(){ 
        if (storedVars.host == 'x'){ 
        var1 = 'a'; 
        var2 = 'b' 
        } else { 
        var1 = 'c'; 
        var2 = 'd';     
        } 
} )();