Someone

NumOfSteps = NumOfSteps + 1;
var NewStep = document.createElement('input');
    NewStep.type = "text";
    NewStep.name = "stp";
    NewStep.size = 100;

var NewStep2 = document.createElement('input');
    NewStep2.type = "text";
    NewStep2.name = "rst";

var NewTitle1 = document.createElement('span');
    NewTitle1.id = "step" + NumOfSteps;
    NewTitle1.style.float = 'left';
    NewTitle1.innerHTML = "Step " + NumOfSteps + ":";

var NewTitle2 = document.createElement('span');
    NewTitle2.id = "resu" + NumOfSteps;
    NewTitle2.style.float = 'left';
    NewTitle2.innerHTML = "Result:";


b.parentNode.insertBefore(NewTitle1, b);
b.parentNode.insertBefore(NewStep, b);
b.parentNode.insertBefore(NewTitle2, b);
b.parentNode.insertBefore(NewStep2, b);