Pastable version of An incrementor function that could be better.

<pre class='prettyprint' language='javascript'>//e is the object, and 'op' is a parameter passed that tells us
//if we're increasing or decreasing the value.
function step_change(e, op) {
     var changeVal;
    //If the value contains a period, then it should be a
    //small change. The value is split so that the script
    //knows how many decimal places to set the value to
    //once the value is changed.
    if ($(e).value.match(/[.]/g)) {
        var numVal = $(e).value.split(&quot;.&quot;);
        if (numVal[1].length &gt; 2)
            changeVal = 0.001;
        else
            changeVal = 0.05;
    }
    else if (parseFloat($(e).value / 10) &lt;= 100)
        changeVal = 5;
    else if (parseFloat($(e).value / 10) &gt;= 1000)
        changeVal = 500;
    else if (parseFloat($(e).value / 10) &lt;= 1000)
        changeVal = 50;
    else
        changeVal = 5;
    //altKeyMod is set elsewhere in the app and doubles the
    //amount if the alt key is held down.
    if (altKeyMod)
        changeVal = changeVal * 2;
    if (op == &quot;+&quot;)
        $(e).value = parseFloat($(e).value) + changeVal;
    else
        $(e).value = parseFloat($(e).value) - changeVal;
   if(numVal)
        $(e).value = parseFloat($(e).value).toFixed(numVal[1].length);
}</pre>
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Pastable version of An incrementor function that could be better.