how passing selected value to change event of select box?

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Javascript

I want to pass value of selected option to onchange function of selectbox, which I make it dynamicly with javascript, how can i do this?
I make select box when the page is loading as follow :

var div = document.createElement("form");
                div.setAttribute("name","frmtag");
                mainC.appendChild(div);

                var sel = document.createElement("select");
                sel.setAttribute("id","sel");
                sel.setAttribute("name","tag");
                div.appendChild(sel);

                var o = document.createElement('option');
                o.value = "All";
                o.text =  "All";
                sel.add(o);

during loading page other options are add to the select box.


if I dont add the select box dynamicly i can add function to onchange event as follow:

<select name="tag" id="sel" onchange="addingBlog(this.value,'1')">
                <option value="All">All</option>
            </select>