try this.. :)
function CreatSpan(){
$("#DivSpan").append("Create Span dynamically..!!");
}
HTML
<div id="DivSpan">
</div>
<a onclick="CreatSpan()">Create Span </a>
click on Create Span link and span will be generate dynamically, If you want more maipulations or doing else then tell me i'll get back to you.. :)