<input type="submit" class="forumbuttons" name="submit[create]" value="NEW" onclick="return confirm('Are you sure ?');" onmouseover="divalert('divalert','This operation will create a new data...');" onmouseout="divalert('divalert');">

function divalert(id,text){

    var el = document.getElementById(id);
    var text;
    if(el){
        el.parentNode.removeChild(el);
    } else {
        var div = document.createElement('div');
        div.id = id;
        div.style.display='inline';
        div.style.top=tempY;
        div.style.left=tempX;
        div.className = "divalert";
        div.appendChild(document.createTextNode(text));
        document.getElementById('logo').appendChild(div);
    }

}