CSSP look-up optimization

1-look.js

/*
 Previous proposal (focus on the code within the hash blocks):
*/

function look() {
    var cssp,
        elem;
            
    if (!document.body) {
        return;
    }

    for (var i = 0; i < csspQueue.length; i++) { // length may change during loop
        cssp = csspQueue[i];

/* ################################################################################# */   
     
        if(typeof cssp[0] === 'string'){
            elem = getElement(cssp[0]);
            // is there a test element to look for?
            if (!elem) {
                elem = addTestElement(cssp[0]);
            }

             cssp[0] = elem;
        }
        else{
            elem = cssp[0];
        }


/* ################################################################################# */


        if ( getZindex(elem) === magicNumber ) {
            cssp[1](); // fire callback
            csspQueue.splice(i--, 1); // remove this item from the queue, decrement i
            
            if (csspQueue.length === 0) { // can stop looking now
                clearInterval(intervalId);
            }
        }
    }
}

2-look-new.js

/*
 New proposal (focus on the code within the hash blocks):
 Instead of doing odd shenanigans with the cssp[0] item, it would be much cleaner and read better
 to check if the elem is undefined and if it is, assign an element to it. Tests pass.
*/

function look() {
    var cssp,
        elem;
            
    if (!document.body) {
        return;
    }

    for (var i = 0; i < csspQueue.length; i++) { // length may change during loop
        cssp = csspQueue[i];

/* ################################################################################# */   
     
        if(typeof elem === 'undefined'){
            elem = getElement(cssp[0]);
            // is there a test element to look for?
            if (!elem) {
                elem = addTestElement(cssp[0]);
            }
        }

/* ################################################################################# */


        if ( getZindex(elem) === magicNumber ) {
            cssp[1](); // fire callback
            csspQueue.splice(i--, 1); // remove this item from the queue, decrement i
            
            if (csspQueue.length === 0) { // can stop looking now
                clearInterval(intervalId);
            }
        }
    }
}